I've ported my complete source code to the gp2x
a little benchmark with chip's challenge:
GP32 (156mhz, frameskip 2, no sound):
70fps
GP2X (frameskip 2, no sound):
104fps
A lot more games are now playable with sound :-) But not all run in full speed yet.

Download Here ---> http://gp2x-emulation.dcemu.co.uk/gp2xhandy.shtml