I've just seen that a new firmware is out on archive.gp2x.de :
http://archive.gp2x.de/cgi-bin/cfiles.cgi?0,0,0,0,42,1051
Fixed:
* SD-Cards up to 2 Gig
* Some LCD tweaks
* MoviePlayer fixed
* Included is a MoviePlayer for TV Out
* Faster SD-Card r/w
And there's a brand new update program that...