I'm a member and a huge fan of Last.fm since 2006, and I actually used it long before that, before I knew how good it was and how addicted I was gonna be. Here's a nice little intro if you haven't seen it already.

Btw, my Last.fm user profile is here: http://www.lastfm.se/user/Zece

I just used SpotifiTunes to get my iTunes Library into Spotify. Well, not really... What I did was that I uploaded my iTunes Library XML file to this service, which created a lot of Spotify links based on genre, artist or album of all the songs in my library. Pretty cool anyway.

 Check it out here: http://spotifitunes.philnash.co.uk/150