
This is apparently the last radio station you will ever need. The concept is based around a clever little piece of software called the audioscrobbler which "scrobbles" tracks from users to a server on which a map is created. This map links artists based on what the users of the site listen to, so if you search for someone you like it should give you a suggestion in line with your musical taste, it is pretty accurate.
Check it out for yourself.
Last.fmThis was setup by a group of guys in London who love music, they started with it as an idea of what they as music lovers would like and it grew from there. Last week they were bought for something like £140,000,000 which is pretty good going for doing something they love.