Useful music sites

Found two of them:

Yes.com is a site that can tell you what your favorite radio station has been playing for the last few hours. Particularly useful during those "uninterrupted music blocks" where the DJ doesn't tell you what's just been playing and you'd really like to know.

Pandora.com is a net radio site that dynamically generates radio stations for you based on umpteen zillion different points of musical similarity. Part of the "musical genome project." It's doing remarkably well so far.