In an effort to make laptop computing as painless as possible, many companies have designed trays and pads on which you can easily rest your laptop while you work. This week, I’ve been testing a few laptop trays that are designed specifically to cool hot laptops and, in turn, cool laps.

I tried out trays from Logitech (LOGI), Microsoft (MSFT) and Belkin that cost $30 each and use fans to cool the underside of the laptop, as well as a larger $50 Belkin tray that has a fan and some extra features. I tried a $20 tray from Kensington that doesn’t include a fan, but elevates the laptop to allow air to circulate under it and keep the hot computer off your lap. None of the trays had cushions for comfort.

Logitech Cooling Pad N100

Of the trays with fans, Logitech’s Cooling Pad N100 ran the quietest — so quiet that it was hard to tell if it was on, aside from the fact that my lap was cooler. The trays with fans kept my lap cool, but the Kensington tray didn’t work quite as well and left my lap feeling a bit warmer than the others. All the trays raise the laptop higher and closer to eye level, a feature that keeps you from hunching over while reading the screen. I liked the $50 Belkin Laptop Cooling Lounge for its generous size, sturdy feel and three adjustable heights.

Even though these trays help to keep your laptop cooler, they don’t do anything about your keyboard, which, on some laptops, also can get hot — especially where your wrists rest. I noticed that my Lenovo ThinkPad X60’s wrist rest area was still warm when I used this laptop with each tray.

Of the $30 trays, the Logitech Cooling Pad N100 (Logitech.com) was the widest, measuring 14.4 inches across. Its gray and green colors are a welcome switch from the bland white used on most trays. The fan on this and the other trays is powered by a short USB cable that plugs into a USB port on your laptop. An indent in the Logitech tray holds the cable flush against the bottom of the tray when not in use.

Logitech says its tray’s single fan has a minimal drain on your laptop’s battery — draining five minutes of total battery time while using a Hewlett-Packard (HPQ) laptop playing a DVD in one company test. I don’t think many people will use these cooling trays on-the-go and will, instead, use them at home where their laptop can easily plug into a wall socket and power isn’t a problem.

Microsoft’s $30 Notebook Cooling Base (Microsoft.com/hardware) will come in white and black when it’s available early this summer (Amazon is accepting orders now). Compared with the Logitech, its fan was a little noisy. But the Microsoft tray was considerably smaller and thinner, making it more portable.

The tray has a fold-away stand that raises it up about two inches on one end. Its USB cable has a clip on its end so that it can loop around and attach to itself, rather than tuck neatly into the tray. Microsoft says that based on an 18 Ampere per hour battery, the Notebook Cooling Base will lessen battery life by only about 4%.

Belkin’s $30 Laptop Cooling Pad (Belkin.com) reminded me of Microsoft’s offering in shape and size. Both are square, unlike the rectangular Logitech tray, and both have flip-out stands and a wave-like shape that leaves open space under the laptop. Belkin says that its Laptop Cooling Pad uses no more than 5% of a laptop’s battery. But the Belkin fan was slightly louder than Microsoft’s and considerably louder than Logitech’s. It also seemed to be a bit stronger, blowing more air than the others.

Belkin’s Laptop Cooling Lounge (available at OfficeMax.com) was the largest tray I tested, wider and deeper than the Logitech tray by a few inches in width and depth. A piece under the tray can be adjusted to raise it to one of three heights, allowing it to rest comfortably on a lap because it raises up or down using a roll of plastic rather than a stand that might dig into your thighs. This tray’s fan was louder than the Microsoft and Logitech fans, but I ignored the noise because it was so comfortable.

When closed, the $20 Kensington LiftOff Portable Notebook Cooling Stand (Kensington.com) resembles a one-inch thick plastic briefcase with handles. Once the stand is opened, one piece lies flat while the other piece is raised to one of two heights, elevating the laptop. The top raised piece supports the laptop and has a hole in the center, designed to allow air to pass under the laptop, thus cooling it off without a fan. However, this no-fan method left my lap feeling a bit warm. When you’re done with the Kensington LiftOff, you can close it shut and carry it using its built-in handles. But its plastic parts felt flimsy and unstable, especially compared with the Belkin Laptop Cooling Lounge.

Of course, you could always just use a regular laptop tray without a built-in fan. It won’t cool your laptop, but if it’s thick enough, it at least could prevent your lap from feeling the computer’s direct heat. Just be aware that hot wrist rests won’t be cooled by these trays.

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://solution.allthingsd.com

Apple (AAPL) has promoted this PC-to-Mac switching concept heavily over recent years — particularly with its “I’m a Mac” commercials, which bluntly compare the Windows and Mac operating systems. Windows Vista has been a source of consternation all its own, and some people have opted for the Mac rather than risking problems with a Vista PC. Apple recently reported that about 50% of the people buying Macs in the Apple stores are new to the Mac.

If you buy a new Mac from the Apple store, staffers there (”Geniuses,” as they call themselves) will transfer your files over to the new machine free. This process takes place in the store, though Apple says it generally isn’t a “while you wait” task. If you buy a Mac elsewhere, such as online or at Best Buy (BBY), Apple stores charge $50 for this transfer.

But some people aren’t comfortable with the idea of handing a computer filled with their personal files over to a stranger. If this is the case for you, some other viable options include copying your old PC’s data onto a portable hard drive or onto discs that are compatible with the new computer. If several home computers are networked, files can be transferred onto a drive accessible by all the machines.

This week, I tried yet another method, copying data from a Windows machine over to a new MacBook using a special transfer cable from Belkin International Inc. The aptly named Switch-to-Mac Cable plugs into USB ports on two computers. It came out a month ago and is available for $50 at places like Best Buy and Apple stores. Like other transferring methods, it moves only files and not programs or applications, such as Microsoft Word (MSFT). (Windows applications can run on a Mac using programs like Boot Camp, Fusion or Parallels.)

The Switch-to-Mac Cable makes it easier to transfer data from a Windows PC to a Mac.

I tested the Belkin Switch-to-Mac Cable by transferring data to a new Apple MacBook from my two-year-old Lenovo ThinkPad X60, which runs Vista. (Most people will transfer from an older PC that doesn’t run Vista.)

After installing the software included and connecting the transfer cable to both the Mac and Windows PC, short, on-screen prompts walked me through the steps for copying data from one computer to the other. On one instructional screen, I checked boxes to indicate what I wanted to transfer, including documents, pictures, music, videos, Internet Explorer bookmarks, desktop wallpaper and desktop files. Here, I could also opt to transfer a custom folder as well as personal information from Outlook like email, contacts and calendar.

I liked Belkin’s simple approach, including unintimidating software and a straightforward cable with a glowing, white indicator. But the files didn’t all properly transfer from my Windows laptop to my Mac. Most notably, the software prompted me to move files on my desktop, but the cable moved only five of the 23 selected files stored there.

Also, I use Mozilla’s Firefox as my default browser, but Belkin doesn’t move Firefox bookmarks to the Mac. Still, my Internet Explorer bookmarks moved over into Safari, Apple’s browser. Belkin explained that it left out Firefox transfers, instead focusing on programs like Safari that come installed on Macs. Even without a cable, Firefox itself will export bookmarks to be moved to the Mac in just a few simple steps.

I had no problems transferring everything else, and things like photos and music moved to the Mac appeared there in logical places. For example, photos stored in the “My Pictures” folder on my Windows PC automatically moved over to iPhoto on the Mac and retained their original folder labels in iPhoto.

In most cases, newly transferred files were clearly labeled on the Mac in folders marked “Windows PC.” After my initial transfer, I used the cable for additional transfers, and the data moved in those follow-ups were labeled “Windows PC-2″ and so on. When my email, contacts and calendar transferred from my Windows Live Mail desktop client, I wasn’t sure where this data had moved within Apple Mail because I didn’t see a “Windows PC” folder. A Belkin representative explained that files transferred to Apple Mail are stored in an “Import” folder.

If your transfer doesn’t work perfectly the first time, try moving stray files into a folder that transferred successfully in a previous attempt. I did this with some of my desktop files when they didn’t move over and it worked, albeit with an extra step.

Over the phone, I walked through numerous troubleshooting scenarios with Belkin to figure out why my desktop files didn’t transfer over to the new Mac, but nothing helped. Belkin said it hadn’t seen my desktop transfer problem in its tests.

I was frustrated to find that Belkin doesn’t offer much in the way of detailed instructions for users, such as a FAQs Web site or troubleshooting steps for common hiccups. Its simplicity is an asset, but when performing an important task like transferring data, I’d rather have the option of knowing more than less. Belkin says it plans to add more help for users in the future.

As its name indicates, the Belkin Switch-to-Mac Cable isn’t designed to transfer data from one Mac to another, nor from one Windows PC to another. Nor will it transfer data from a Mac to a Windows PC. Additionally, all hidden directories and system directories are ignored, as are all files with the following extensions: .exe, .com, .dll, .scr, .ini, .db, .lnk.

Not tested was a competing product from Detto Technologies, the $50 Move2Mac, which comes in two versions: One enables transfers from older PCs without USB ports, the other enables transfers from PCs with USB ports that are running Windows 98, Millennium, 2000 or XP — but not Vista, which the Belkin enables.

If you’re moving away from a Windows PC, Belkin’s Switch-to-Mac Cable is one tool that can make this transition easier.

Edited by Walter S. Mossberg

Write to Katherine Boehret at mossbergsolution@wsj.com

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