i have a psp,nintendo ds lite,xbox360,ps3,wii n64,ps2 and my personal favourite the sega dreamcast....emulators i really wanted for this device was a working dreamcast one..
iv'e seen the specs of the iphone 4 and is actually beter than the n900.
dont take my word for it,have a look up yourselfs...the unreal 3 game engine works on iphone dammit!!! and top notch games are coming nearly every 2,3 days for the iphone!!