Castaway 0.03 which is an atari st emulator for the gp32 has recently been released. looks brilliant, apparently runs at a very good speed, screenshots of dungeon master, xenon and xenon 2 working. supposed to be very compatible, llamatron and stunt car racer also confirmed as working!
check it out http://www.codejedi.com/shadowplan/gp32.html
how many more reasons do you need to own this fabulous machine