There are more of them.Just to clarify what everone seems to know by now, these aren't videos of some superhuman gamers completely powning games. They're gamers using an emulator that records button pressings, so they play a game with slow-mo and retry with save-states to create one superhuman playthrough of a game that's "real", and could be performed by anyone, assuming you were good enough, and your controller didn't explode under the pressure.

I don't think Morimoto (the guy who kicked things off with his SMB3 playthrough) ever claimed that he was as good as the video, but his legend preceeded him, and was understandably overblown.
Anyways, the link above appears to be their homepage. The "fmv files" (records of the button-pressings) are stored there, as well as videos captured of the button-pressings in action. You'd need Bittorrent to download the videos.
I reccommend looking at the Gradius video. You can't do much about the speed in Gradius, so Morimoto just has fun with it. No powerups except "speed". You'd think the game would stop letting you get faster after some point. But it doesn't. I doubt that ths one could actually be replicated in person. The controller just can't be responsive enough for this stuff without slow-mo.
I also liked watching Castlevania, because the slower pace of the game makes it look completely possible. Except that I've never managed to take out Death. And this guy makes him look so simple. "Just use holy water." Yeah right. Y'know, I had never seen how similar Dracula is in the first game to the Dracula in Dracula X on the Turbo Duo (and the start of Symphony of the Night on the PSX). I wish they had let the ending run. Stupid motivation to make me go and get pointlessly killed by Death a few more times. Or just download the fmv-file and the right NES emulator and let it run longer...
Now, I'm off to watch the newly-added Zelda and Metroid playthroughs.