Great thread. I really, really want to get one of these guys for my home stereo system. The Audiotron was my frontrunner for a while (the only three I considered were the SlimP3, Prismiq, and the Audiotron), but then I found out about the XBox Media Player (http://www.xboxmediaplayer.de/newweb/news_latest.php).
There's a few things going against it...er...it's illegal or at the very least, shady, requires a mod chip, and a bit of tinkering. It would, however, be awesome for mp3 playing, DivX and digital picture viewing, and I would love to get a MAME port running.

I'm just debating how much time I want to dedicate to yet another electronics/geek toy project.

-Mark