Mostly just what emulators there are, how well they work and how easy they are to install. I figure I'll probably have to stick to the SNES, Megadrive and suchlike, but it'd be nifty if I could get some PS1 and N64 games working on it, too. Obviously, the main reason I want the phone is for the game pad, so please refrain from pointing out "better" phones unless they have an actual game pad as well (I'm pretty sure there aren't any).