KidPaddle from the german GP2X forum managed to compile a little space sidescroller shooting game written with Pascal for GP2X. The game has some bugs by now, the gameplay is simple and graphics are minimalistic, but imho it's awesome that the first game has been ported to GP2X and it's running quite well!
Link to the thread: Click (well, it's completely in german)
Link to his game: http://www.seban.de/download/sfighter.zip (Size: ~ 2 MB)
He set a cross compiler environment in Windows XP with coLinux and FreePascal 2.0.4. Furthermore, he also support Paeryn's SDL, which is a slightly modified SDL library written in "C" providing hardware acceleration for GP2X.
KidPaddle will provide a coLinux ISO Image in the soon future with all configurations included so we could be able to write our own games with his help.