Here’s a nice little idea:
You type in the name of a band that you like then they generate a streaming radio station with tracks that are similar to the band that you like. You get ten hours free, after that you have to pay, but I think it’s a really neat idea, and the application of it is brilliant. Give it a try next time you fancy some tunes.
You might also be interested in last.fm, which builds up a profile of music you like (mine’s at http://www.last.fm/user/mad_goldfish/) and builds a radio station out of that, as well as radio stations from artists, user groups etc. It’s pretty cool for finding new music.