While Linux marches ever closer to being user-friendly, there are still a few loose ends to be tied up. Networking continues to be a bit of a sticky spot, and Bluetooth support is definitely in need of some refinement. But another area, and one which you would expect to have been tied up nearly by now, is sound. The PulseAudio server can help you take care of this problem, but simply installing it doesn't clear up the problems with programs taking the sound card and never letting you have it back.
Sun co-founder John Gage, who coined the phrase "The Network is the Computer" which later became a Sun slogan, is today entirely correct. Oh sure, he's not semantically correct, but he's basically correct in that the true power of the computer is not realized until it is connected to something. MP3 players are little computers that are networked to your computer long enough to load music on to them, for example. One useful and basic thing we can do to cause computers to participate with one another is to copy files between them. Sometimes it's most effective to just do this with a disk, but if they are connected to a network, it's usually easiest to copy the files that way, if not fastest.
The HP iPAQ H2215 is a 400MHz Xscale-powered Windows Mobile PDA. It ships with Windows Mobile 2003 (Windows CE) and has an SDIO slot, a CompactFlash Type II slot, and bluetooth wireless functionality. The unit has a rotated 3.5" QVGA screen (240x320) which displays 16 bit color, and is powered by a 900 mAH Lithium-lon battery (or an optional 3600mAH battery which makes the unit quite a big larger.) All in all, this is a credible PDA, but I do wish it had WiFi.