Now AudioScrobbler has become last.fm and has jumped ahead in the ease of use and features they offer. From the last.fm website:
Join the social music revolution at Last.fm. It's fun, it's free, it's all about the music.
You get your own online music profile that you can fill up with the music you like. This information is used to create a personal radio station and to find users who are similar to you. Last.fm can even play you new artists and songs you might like. It's addictive, it's growing, it's free, it's music.
The coolest thing is the streaming 'radio' stations that are provided. If you have only a standard membership (free) you are given a station called 'neighbour radio' which uses your listening data in conjunction to others' listening data to create a radio station with the stuff you like and some new stuff you might like too. Using the open source player they provide, if you don't like a song they suggest you can mark it to not get played again. Alternatively, you can also rate a song as a favourite and it will get played more often.
The data is sent to last.fm by a plugin that is installed into your favourite music/media player. There are clients for iTunes, Windows Media Player, WinAMP, XMMS, XBox Media Center and lots of others.
Weekly Top 10 Artists - Sunday Feb 12 - Sunday Feb 19
Overall Top 10 Artists - Since December 2004 (6,631 tracks played)