Ken Edwards let me know of a review for the GP2X he has recently done, heres an excerpt of that review:
The GP2X is a Korean-made, Linux-based handheld that shares many features with the PSP. In some cases, the GP2X dances circles around the PSP. But the GP2X is not for everyone. It is not the most accessible handheld — it takes some tinkering to get things working the way you want.
GamePark is planning on going toe-to-toe with Sony and Nintendo with the release of the XGP and XGP Mini, set to launch this year. GamePark Holdings, with the original GP32 design team, released the GP2X to keep with the goals of the GP32 audience.
If you can get past the fact that this is not a Sony or Nintendo handheld, and things crash here and there, you will do fine with the GP2X. It is nothing out of the ordinary from running Debian or Fedora on your PC.
With a video player, music player, photo viewer, e-book reader, and Linux based emulation and homebrew applications, this is truly a portable multimedia powerhouse. Add to that support for things such as DivX, XviD, and OGG, and you really have the complete package
Read the full and very detailed review over at Blogcritics.org here --> http://blogcritics.org/archives/2006/04/17/193251.php