Yes N64oid is the best one atm, 4.99 on the SlideME marketplace, ran classics like Goldeneye and Zelda OoT no problem, minor lags here and there but on a dual-core phone (Bionic or new Razr) would probably be flawless. Has on-screen controls for touch-only devices but even has bluetooth support through Bluez IME for controllers such as the Zeemote, iControlPad and even the Wiimote, hoping they create drivers for the bluetooth keypads soon, such as the Magic-Pro series.
Roms you can find from sites like coolrom.com or the ROMS Plus app on SlideME (for legal purposes I must say please support the game companies, only download if you own or have owned the actual game)
Looking still for a decent PS emu, will post if found..
Paulscode, very interested in your project, will it also have BT support?