There are some sites out there that have been running NES emulators for at least 7 or 8 years now. I can remember my brother showing me one at christmas the year I got my 16MB Voodoo3 video card to put in my screamin P2 500 so I could play Air Warrior with the eye candy turned up (such as it was). Pretty cool actually. I found a site once that had Atari 2600 games too, but I lost the link during a reformat. Ah well.