As technology continues to shrink, more features are being packed into these small mobile devices, making navigation and ease-of-use more important. This week, I tested the Motorola ROKR E8, which costs $199 with a two-year T-Mobile service agreement and makes a real attempt to be more user-friendly. The device, which comes out on July 7, isn’t much bigger than a typical cellphone but its standout feature is its keyboard, which dynamically changes to accommodate whatever you’re doing at the time, revealing only buttons that would be of use to that particular function.

The secret sauce on the ROKR E8 is its keyboard, which changes when it’s used as a phone, music device and camera.

The surface of the ROKR E8 has no physical keys at all. In its off or resting state, in fact, it’s just a black surface with rows of tiny, unlabeled bumps. But this surface is actually divided into two: The top half works like a typical cellphone display while the bottom half projects virtual keys onto its surface and uses the rows of bumps to give these keys a physical presence.

When making a call or sending a text message, the ROKR’s surface displays a regular phone keypad. But as soon as a music shortcut button is pressed, the surface morphs into five buttons for music navigation: play/pause, seek forward, seek backward, shuffle and repeat. Pressing another shortcut button to start the ROKR’s camera mode shows four buttons for zooming in or out, switching to playback mode or changing to video. Motorola (MOT) calls this its ModeShift technology. Though the lower half of the ROKR can be considered a touch device, objects can’t be manipulated with gestures like pinching or dragging as with the Apple (AAPL) iPhone’s multitouch screen.

Overall, I found that the ROKR E8’s dynamic keyboard gave me a real advantage in figuring out how to use the multi-functionality of the phone. Its changing keyboard eliminated a lot of guesswork and time that I may have spent hunting through menus for a command. And true to its name, the ROKR (pronounced “rocker”) is focused on its music phone functionality with an FM radio, a neatly organized music menu and a speaker that has convincingly simulated surround-sound effects.

But this ROKR didn’t always jam out in perfect pitch. A touch-sensitive semicircle in the center is meant to make scrolling through long lists easier — much like Apple Inc.’s iPod wheel. But because this tool on the ROKR isn’t a full circle, scrolling felt unsatisfying. You also can’t buy songs with the ROKR, or even mark songs for purchasing later on a PC.

And while the morphing buttons look futuristic and hip, I experienced a few instances when the phone was slow to react after I touched a button, as when I touched the seek forward button while listening to music or when I chose to open an MMS message I sent to a friend.

Twenty-two tiny bumps dot half of the ROKR’s surface, and the surface below each bump vibrates when it’s touched to provide sensory feedback. Nothing is ever physically pressed down, though the vibration response leads you to think otherwise.

A smart switch on the side can be held down to turn it on or off, or switched into the upward position to lock the device, preventing accidental calls or battery drain.

The ROKR E8 runs on T-Mobile’s (DT) GPRS/EDGE connection, which felt sluggish at times. And not even the dynamic keyboard on this device could help make email or instant messaging easier.

It has a two-megapixel still camera with an 8x digital zoom that can change into video-camera mode in one step. Two gigabytes of memory are built into the ROKR, and more memory can be added via a microSD card slot, which is hidden beneath a back panel. A one-gigabyte microSD card comes with the ROKR. Without this card, the internal memory will hold about 1,500 songs.

With help from a USB cord and Windows (MSFT) Media Player 11, I transferred over 200 MP3s onto my ROKR. Album art that transferred with my songs appeared on-screen as songs played, and the speaker gave off a powerful sound. Built-in stereo Bluetooth can send tunes to Bluetooth-enabled stereo speakers, and it took me just a few seconds to pair my ROKR with Motorola’s EQ5 speakers.

A preloaded program by Shazam lets users hold the ROKR up to any speaker playing a song, and in 30 seconds, identifies the track title, artist, and album art. I held the ROKR up to my alarm clock radio and it worked perfectly. But once these songs are recognized, the track data can’t be used to buy the song or even to transfer a request to buy that song to a PC for buying online at another time.

The ROKR’s FM radio will work only if its included stereo headset is plugged in because the headset has the radio antenna. But once the headset is plugged in, the radio will play via the ROKR’s speaker.

The ROKR E8 has an audio technology called Crystal Talk, which Motorola says allows your phone to perform better in loud environments. Even if the person on the other end of your phone is in a noisy place, the company says Crystal Talk will raise the volume to improve the call. I tested this by speaking to someone on the ROKR while turning a hairdryer on beside the phone. I then used a regular Razr cellphone. The person on the other end said that the ROKR sounded slightly, but noticeably, better.

Motorola’s ROKR E8 is a head-turning phone with many built-in advances that give it a smarter interface. One might wonder what other ModeShift functions the company will integrate into its devices in the future, such as a full QWERTY keyboard. The overall idea of a dynamic keyboard is a step ahead for small devices. It forces the phone to work more intuitively and improves navigation while looking stylishly sleek at the same time.

Edited by Walter S. Mossberg.

Write to Katherine Boehret at mossbergsolution@wsj.com

But to the style-conscious set, the Flip looked like a clunky Fisher-Price toy — especially when compared with a sleek, new iPod or more-sophisticated digital cameras — and was too thick to comfortably slip into a pocket. Last fall, Pure Digital introduced an enhanced version: the Flip Video Ultra, but its biggest aesthetic difference was new orange, pink and green colors.

Today, the company will begin sales of its $180 Flip Video Mino (pronounced “minnow”), the hippest offering yet from Pure Digital. This 60-minute Flip includes many firsts for the company: rechargeable batteries; touch-sensitive buttons rather than old-school, push-down buttons; and a thinner build that measures 40% smaller, overall. The Flip Mino is also the first one in the family to enable publishing to MySpace (NWS); prior software limited Web-site sharing to YouTube (GOOG) and AOL (TWX) Video.

I’ve been using a glossy, black Flip Mino (it also comes in white) for the past two weeks and it looks much cooler than older models. Its newly positioned USB adapter pops up from the top of the camera like something from a Swiss Army Knife. The Mino offers features such as the ability to lock the delete button, so no one accidentally deletes your videos, and mute all camera sounds, so as to record silently during quiet moments like wedding ceremonies or speeches.

I brought it along with me almost everywhere I went because of its small size and light weight, even fitting it into a thin clutch purse with a cellphone and BlackBerry (RIMM). I used the Mino in various situations ranging from bright, scenic outdoor settings to indoors while eating dinner in a candle-lit restaurant. Overall, I was pleased with the sound and picture quality of the Mino, and I found its built-in software, which automatically starts when the camera plugs into your Mac (AAPL) or Windows (MSFT) PC, to be a pleasure to use.

Today, Pure Digital Technologies introduced its $180 Flip Video Mino, a thinner, more stylish version of its point-and-shoot camcorder.

It took just a few minutes to trim excess footage from my videos before saving them to my computer or sharing them with friends and family. Another way to share videos from the Flip Mino is via Pure Digital’s server, which sends emails with embedded video links, saving upload and download time on both ends. Though I didn’t publish any of my videos on a public Web site, AOL, MySpace and YouTube were just one step away.

The Flip Mino’s touch buttons, while stylish, were difficult to use at first. I missed the tactile feel of physical buttons as I tried to hold this small video camera and press the zoom buttons using just one hand. The new, touch-sensitive buttons weren’t as satisfying and stable to use, and I pressed them accidentally more than a few times. For instance, the Zoom Out button is directly below Record, making it easy to mistakenly touch it. After about a week of using the Mino, I grew more accustomed to using these new touch buttons, but it shouldn’t take so long to make the adjustment.

Just looking at the Flip Mino’s fresh new exterior makes it hard not to think about the things that this redesigned camcorder is still lacking, like a larger viewing screen (the Mino screen is 1.5 inches, no larger than that of the Flip Ultra), high definition video and wireless sharing capability. These features would likely raise the price and/or tax the battery, and many users of the Flip flock to it for its low price and simplicity. Still, Pure Digital says that it will offer HD video and a larger screen on a product within a year, and is looking into features that might include wireless transferring.

I grew fond of the Mino’s rechargeable battery. Whenever I plugged this gadget into my computer to transfer videos, my Mino charged up via USB without me having to think about it. A full charge lasts four hours and recharging a dead battery takes about three hours.

Pure Digital says that the sound quality and lighting are improved in this model. Like previous models, this Flip records in 640×480 pixels at 30 frames per second.

The Mino didn’t have a problem with lighting in most situations; indeed it did a nice job of capturing images of my family sitting around a table in a restaurant with little more than candlelight to brighten the picture. It doesn’t use a flash or a built-in light, but instead uses automatic sensors to adjust to various levels of light.

This svelte camcorder seemed to handle noise more evenly than I remembered in prior Flip models. It didn’t make my voice sound unbearably louder than everyone else’s, even though I was closest to the camera’s microphone, yet it managed to detect voices across the room. I did have some trouble on a windy day: While recording a quick video of a golf course in San Diego, wind audibly muffled my voice during a few moments in the video.

Along with the delete-lock and sounds-off settings, this Mino has a few other tricks up its sleeve. Each of the touch-sensitive buttons is designed to glow only when usable, so as to better help people who might not know which buttons to press while using this camcorder. For example, only the zoom buttons glow while recording since the other buttons (volume, play/pause and delete) can’t function in this setting.

Shortcuts built into each button provide more functions: Holding the play/pause button down will set the playback mode to play all videos on the Mino; holding the seek ahead or seek back buttons while watching a video will fast-forward by seconds within that video; pressing the record button as the camera starts up opens up the settings menu.

In conjunction with the Flip Mino’s introduction Wednesday, prices of the former Flip Ultra model will drop to $150 for the 60-minute model. The Flip Ultra 30-minute model will be phased out, as will the Flip Classic, which will cost $130 for a 60-minute unit.

Though the Flip Mino’s touch-sensitive buttons look great, they aren’t as functional as they needed to be. But if you really want a sleek, hip-looking gadget, you’ll learn to adjust to these new buttons. No matter which Flip you choose, Pure Digital’s software changes the way people capture and share videos, and that’s a great thing.

Edited by Walter S. Mossberg

• Email mossbergsolution@wsj.com

This week I tested SeeToo, a free service that lets you share videos in the same time that it takes to open and watch them on your own computer. Even better, you get to watch the video along with the people with whom you’re sharing it and type comments to each other in real time.

SeeToo works when one user selects a video to share with other people, who get an emailed hyperlink to SeeToo’s Web site, seetoo.com. After opening the link, these people join a SeeToo session during which everyone can watch the same video at the same time.

With SeeToo, you and your “buddy” can watch and chat about a video at the same time.

While the video is playing for the group, each viewer can pause, rewind and fast-forward the video. A space below the playback screen allows friends to send instant messages to one another during the session. There aren’t any limits to the size or type of video file that is shared, and other types of media — including music and photos — can also be shared on SeeToo without size restrictions.

SeeToo sounds too good to be true, and in many of my tests, it was. The service became available to the public in January in its beta, or test, stage. But I’ve used many other products in beta that were in better shape than SeeToo. And there is one major catch: Once a video-sharing session is over, the participants, other than the person sharing, can no longer access the video.

People who are invited to watch videos on the service can do so using any popular Web browser (Internet Explorer, Firefox or Safari) on Windows (MSFT) computers and Macs (AAPL). But the person actually supplying the video and initiating the sharing session can use only a Windows PC. The initiator also must download a browser plug-in, which seems old-fashioned in the world of Web-based applications. And sharing sessions time out after 15 minutes of inactivity on the initiator’s side, after which point the email link doesn’t work.

I was able to successfully initiate a SeeToo session using Firefox and Internet Explorer on an older Windows XP computer but had trouble with two computers running Windows Vista: Neither worked with SeeToo using Internet Explorer and only one worked using Firefox. SeeToo says this is due in part to Microsoft’s new Service Pack 1 for Vista, and the company claims it will have this problem fixed by today. I also had trouble with the sound.

The concept behind SeeToo is also somewhat limiting. Some people may not be able to watch a video exactly when someone else wants to watch it. Some might rather watch videos alone than with others. And typing out back-and-forth chats while videos are playing could be somewhat of a distraction from watching the video.

I tested SeeToo by sharing video with family and friends and watching video they shared. My sister and I got a kick out of watching video footage from a wedding I attended in October. I shot the video using an inexpensive, low-resolution Flip Video camera and the footage looked pretty good. But SeeToo’s site shares video on a rather small screen, and we both wished it were larger.

We sent instant messages to one another in a small space below the screen, making comments about the guests’ dance moves and the DJ’s choice of music. I used on-screen tools to pause the video when the camera passed by a friend whom I wanted my sister to see. To take a second look, she selected her screen’s Take Control button and rewound the footage to see my friend.

For the first two seconds of a video, users can see a small image in the top right corner of their screen that displays what the other people are seeing. SeeToo explained that this is a way of confirming one person is indeed seeing the same screen as another person.

I originally invited three people to watch the video with me. One friend I invited was at work, where his computer restricts him from watching videos. When he got home that night, the email hyperlink didn’t work — nor did it explain that the session had expired. Instead, it crashed his Firefox browser. I also invited my boss to watch the video with me, but he only saw my invitation two hours later when the session was over.

I didn’t even try to invite my parents to see the video because neither of them sit in front of a computer all day long and they wouldn’t have received my invitation in time to see the video.

In some ways, it was probably better that the other people I invited to watch the video weren’t able to see it, because the instant-message chat screen currently labels everyone as “buddy,” without distinguishing one person from another. SeeToo hopes to change this in future versions of the service by offering users a chance to register, thus receiving a specific nickname for chatting purposes. As of now, no one who uses SeeToo needs to enter any personal information such as a name or email address, which is a plus. SeeToo is also ad-free as of now, but the company plans to monetize parts of the service sometime this summer.

I also shared music and photos with friends using SeeToo, but this feature isn’t obvious; the site is primarily focused on sharing videos. Music playlists can’t currently be shared with friends, nor can photo slideshows be shared. Instead, individual songs or photos must be selected and shared within a session, one at a time.

SeeToo has high hopes of adding many features in the future, probably by June. Those features include a full-size, higher-resolution viewing screen for sharing and watching videos; a fully Web-based, download-free version of SeeToo; photo slideshows; using names to distinguish viewers; and sharing sessions that don’t time out. In addition, it hopes to let Mac users initiate sharing sessions. The site aims to be out of its testing stage by September.

Right now, SeeToo can come in handy if you know someone else is at a computer and ready to watch a video. The invited guest never downloads anything and neither party needs to register to use SeeToo. But its screen is a bit on the small side, and the service needs to become more versatile before it can be seen as a reliable sharing site.

• Email mossbergsolution@wsj.com