last.fm

Today I got informed about this music service called www.lastfm.se
You register yourself on the page, download a little program and install it on your computer.
Each song you play from either Spotify, Winamp, iTunes or Windows mediaplayer is recored on the website.

The website then figures out what kind of music you are into and suggests music from the same genre. You can also choose radio with your favorite artists!
Pretty cool :)

You can see my library at http://www.lastfm.se/user/arzusah