I don't usually watch speed run videos, but this one is a particularly good example from the last Awesome Games Done Quick. 4 players head to head on Super Metroid, with some great commentary that not only points out what to look for (live), but offers some background on speedrunning and running Super Metroid in particular. It's about 45 minutes long, but worth a look if you're a fan of the SNES game.
[youtube]http://www.youtube.com/watch?v=NuHujQ9q-Vw[/youtube]
[youtube]http://www.youtube.com/watch?v=NuHujQ9q-Vw[/youtube]