One welcome sign is an effort by companies trying to improve Microsoft Corp.’s (MSFT) Windows Mobile operating system, which has a reputation for confusing navigation and hasn’t had a major update recently. Kinoma Inc., for example, recently released an application called Kinoma Play that runs on Windows Mobile devices and gives users a markedly better way of handling photos, videos, music and Web browsing.

The HTC Touch Diamond, due out this month from Sprint, tries to hide Windows Mobile software.

This week, I tried yet another software program that is designed to run on top of Windows Mobile software. But this time, the software is at the heart of a device designed by the same company: HTC Inc. I tested the HTC Touch Diamond, due out from Sprint (S) sometime this month for $250 (after a $100 mail-in rebate) with a two-year contract.

Taiwan-based HTC started out in 1998 as a maker and designer of mobile devices for other companies. A year ago, HTC launched the first device under its own name in the U.S., and now, Sprint, AT&T (T) and T-Mobile (DT) sell HTC-branded devices. The Diamond incorporates HTC software, as well as software from Sprint, MobiTV, TeleNav and others. But it isn’t a stretch to imagine HTC trying to create a fully end-to-end model (hardware and all software) in the future.

The Diamond has a touch screen, but it’s smaller than Apple’s (AAPL) iPhone — 2.8 versus 3.5 inches. This screen lacks the iPhone’s multitouch functionality, and its smaller size robs space used for touch gestures like flicking or scrolling with a finger. Yet like the iPhone, it relies solely on an on-screen keyboard for all text entries. Even with the Diamond’s stylus, the keyboard felt small and cramped. Using just your fingertips was next to impossible.

After using the Diamond for a week, I can say that despite its handsome TouchFLO 3D software and animated icons like photos that flip from one to the next with a flick of finger, this device failed to disguise the frustrating interface of Windows Mobile often enough for my taste.

It reminded me of the brown paper bag book covers my Dad helped me make for schoolbooks when I was a kid: They looked great on the outside, felt sturdy and clean and created a blank canvas for homemade doodles that were often more interesting to me than the books they covered. But my book covers couldn’t change what was underneath; pages of frustrating algebra were just a flip away.

HTC’s sleek software tries to hide Windows Mobile, but menus from the Microsoft operating system are constantly popping up. HTC’s email program, for example, is represented by an animated envelope icon that, when selected, cleverly flips twice before sliding an email message half-way out and giving you a three-line peek at what’s inside. If only reading and responding to email were half as entertaining. Selecting the animated envelope opens the old, cumbersome Windows Mobile email program.

Also, the touch capabilities of the Diamond’s screen didn’t work as well as they should. Finger flicks that should have scrolled through lists instead seemed to select individual items in a list, as if they were sticky.

The Diamond isn’t all bad, of course. Plenty of people will like its smaller size because the iPhone and RIM’s (RIM) BlackBerrys seem too large and brick-like to hold up to an ear for phone calls. Next to my BlackBerry Curve, the Diamond was of comparable thickness but measured smaller in width and length.

Despite its size, the Diamond is packed with features. It has a 3.2-megapixel camera with autofocus that doubles as a camcorder, and comes with four gigabytes of internal memory and a removable battery. I taped short videos — something the iPhone can’t do — and found the sound and video footage to be adequate.

HTC touts the Diamond’s browser, which is based on the Opera browsing engine but is designed for HTC. It opens Web pages in views that fit the screen and text is automatically resized as users zoom in or out, though this resizing was sometimes slow.

Unlike the iPhone, Web sites that are opened on the Diamond’s browser don’t resemble the actual site as you would see it on your computer. I opened CNN.com (TWX) and WSJ.com (NWS), two sites that are packed with text and graphics on a regular browser. On the Diamond, they quickly were rendered in list format with mostly text-only. I easily touched the screen to follow links to full stories.

Like the iPhone, the Diamond has an accelerometer, though it’s called the “G-Sensor.” When it worked, this feature flipped the screen to match the horizontal or vertical direction in which the device was being held. Photos flipped instantly, but the Diamond’s G-Sensor took almost three full seconds to respond as I flipped from vertical to horizontal while using the browser. And some Web sites didn’t respond to the G-Sensor flips at all.

A special YouTube application developed by HTC was easy to find on the device and worked quickly. My videos were organized into categories for All, History, Bookmarks and Search, though this last category required using the finger-fumbling keyboard. In one step, I emailed a link from a YouTube video to a friend using the device, with a still shot from the video included in the message.

Overall navigation on the Diamond isn’t as intuitive as on the iPhone or iPod Touch, nor was it as easy as on a touch-screen Windows Mobile device running the Kinoma Play application. The iPhone and iPod Touch use quick double-taps on touch screens to zoom in or out, and multitouch capabilities resize images with pinching gestures; Kinoma Play uses a long touch to zoom in. The Diamond used double tapping on some screens, but not enough for me to grow comfortably reliant on it. A small, circular pad beneath the device’s touch screen provided a more dependable method for zooming in or out of screens: tracing the perimeter of this circle clockwise with a finger zoomed in; counterclockwise zoomed out.

The HTC’s software animation is put to good use on its Weather screen. Here, animated illustrations of each day’s weather appear on the screen: suns spin, clouds move in, rain appears to fall. Even moons appear on the device at night to accurately reflect the weather in a city at a specific time.

It is exciting to think about other mobile-phone companies giving better software a real try, especially those that attempt to improve Windows Mobile. But HTC’s Touch Diamond doesn’t hide the outdated operating system well enough or often enough for a user to want to buy a whole new mobile device.

Edited by Walter S. Mossberg

• Email us at mossbergsolution@wsj.com. Find this and other columns and videos online free at the All Things Digital Web site: http://walt.allthingsd.com

Bet you’re thinking about Apple’s (AAPL) iPhone.

I’m actually describing a Windows Mobile device. In fact, any touch-screen Windows Mobile device made in the past couple of years can perform the aforementioned functions — as long as it’s running a new application called Kinoma Play.

This much-needed shot in the arm for Windows Mobile comes from Kinoma Inc. and for $30 can be downloaded onto a computer or directly onto a device from www.kinoma.com. It works on touch and nontouch screens alike, though touch features do add a lot of pizzazz. After installation, Kinoma Play seems to totally take over the device’s multimedia functions, hiding every trace of Windows Mobile’s clunky, antiquated, menu-driven operating system.

Kinoma Play in action, clockwise from top left: a media interface, touch-screen navigation, upload to YouTube, picture rotation, search by characters, and photo zoom.

It smoothly opens and displays all types of media, including photos, videos and music. But it’s also a fast search engine for multimedia content on the phone, on the Web or even on your computer via remote search. Kinoma Play works with services including YouTube, Audible, Flickr, iDisk, Live365, Orb and SHOUTcast. And a section called the Kinoma Guide compiles over 100,000 podcast episodes, radio stations, videos, live television and Webcam clips, panoramas and photos into easy-to-browse categories.

After almost a week with this application, I changed the way I thought about on-the-go Web browsing for media. I forgot about typical browser functions like typing a Web site’s name into a URL bar and instead did plenty of things online with my portable device without deliberately thinking about being online.

Kinoma Play is so well-designed that I wish it could entirely replace the dated Windows Mobile user interface, which still lags behind the iPhone’s. But, alas, it’s about media only. It isn’t designed to supplant, and doesn’t change or improve, any of the phone’s more common functions, like overall email and Web browsing, calendar, contacts or productivity programs.

Kinoma is working on Symbian, Linux and even iPhone versions of its application and will release one of those versions by the end of this year.

I ran into a few problems while using Kinoma Play. On three different occasions using two different devices, my touch screen froze when I tried to start the application, and the only way I could fix the problem was by completely rebooting my device. Once in a while, I experienced slow performance, though this could have been attributed to my network connection. And Kinoma Play lacks a one-step shortcut to its home screen; currently, users must press a “Back” soft key on each screen until they reach the home screen.

But the pluses of Kinoma Play outweighed these hassles, especially considering how enjoyable this application was to use. I tested Kinoma on two Palm (PALM) devices running Windows Mobile: the not-yet-released Treo Pro, which will be available here in the fall for an unlocked, unsubsidized price of $549, and the $250 (after discounts and two-year-contract rebates) Treo 800w available from Sprint (S). Both have touch screens that work best with an included stylus, though a fingernail or fingertip worked for me in most cases.

Upon installation, Kinoma Play automatically scans a device’s media and organizes it into categories under a section called My Media Files. I was especially eager to see how photos were handled, so I started out in the Pictures category.

All Kinoma screens have a set of familiar navigational tools that appear as soft keys at the bottom of the screen; they show up when the bottom section of the screen is touched and disappear when touched again. On the bottom left, a “Back” arrow takes users to the previous screen. On the bottom right, a list-like icon represents what Kinoma calls the Menu Pod. When touched, this pulls up three succinct menus — for media, settings and another action related to the program that’s open.

I opened some photos that were stored on the Palm Treo Pro and touched the center of the screen with my finger. A quick tap on the screen zooms in on each photo, and a small inset of the photo with a box representing the magnified area appears on the lower right of the screen. I dragged this tiny box around in the inset image to change where I was zooming. To zoom in on a photo slowly, I simply touched and held my finger on the screen for a longer period of time. A quick tap after either zooming method will quickly snap the image back to normal view.

I moved from one photo to the next as I do on my iPod Touch: by placing a finger on one edge of the photo and flicking left or right across the screen. Rotating was fun and easy to do when I drew a circle on the photo with my fingertip in the direction that I wanted it to rotate. The image followed whatever motion I drew. To rotate the photo 180 degrees, I drew a larger half-circle.

I selected Flickr from Kinoma Play’s list of services and signed into my Flickr account in just a few steps. My photos and those of friends were just as easy to browse as my own photos, thanks to Kinoma Play’s built-in tools. The Menu Pod icon offered a one-step way to play all photos in slide shows; music could be selected to play in the background.

With a touch on the Menu Pod icon, users can add any media to favorites or to an “on-the-go” list. This same tool also sends multimedia to others via email; I used it to send friends photos of a recent trip to California as well as a YouTube link to video footage of Sen. Joe Biden speaking.

Kinoma makes something out of every action. The Menu Pod button seems to jump into the center of the screen when summoned, and each of its three menus spins like a tiny top to get out of the way so another menu can be seen. Other screens seemed to do a mini back flip as they opened or closed. And long lists seemed to bounce when scrolling reached the top or bottom.

In the Services menu, I used Audible to listen to part of an audio book and listened to rock and country songs on Web radio stations from SHOUTcast and Live365.

I particularly liked using the Kinoma Guide, which is constantly updated with material that streams to your devices when you open it. I found a Restaurant Guys podcast in which chef Cat Cora was interviewed, and even saved it for later listening by downloading this seven-megabyte podcast to my device in one clean step. Kinoma wisely adds all downloads to a special section that’s easy to find. The last 100 things you looked at on Kinoma Play can be found in a section called History.

These days in the tech world, much attention is being paid to applications sold on Apple’s App Store for use with the iPhone or iPod Touch. But Kinoma Play is one application that is desperately needed by Windows Mobile users, and it just might remind them that they can better navigate media-related Web services — without having to buy a new mobile device.

Edited by Walter S. Mossberg

• Email us at mossbergsolution@wsj.com. Find all our columns and videos online free at the All Things Digital Web site: http://walt.allthingsd.com