Nintendo Emulator for Tmobiles android G1 named NesEmu. Make sure to roll the trackball around once you load a game or the buttons wont work. One more reason im so glad i decided to get the G1 instead of the iphone!...
Nesoid Lite is a free Nintendo emulator for Android mobile phones available through Android Market. It runs really well on my HTC Eris, and if you get Download Crutch (or Linda file manager), you can download roms from the phones browser directly to the phone....