This idea may or may not work... either way I though it'd be a cool way for people to expand their knowledge of the bands playing. So you can search around Hype Machine, Pitchfork, various mp3 blogs etc. etc. or upload your own on Yousendit/sendspace/megaupload, and link mp3s of bands you think people should check out. I'll start!
Girl Talk - "Bounce That" (Dance/Rap/Mash-Up fun)
Hot Chip - "And I Was a Boy From School"(electronica/pop)
Tokyo Police Club - "Nature of the Experiment"(indie-rock)