I recently wrote two articles on Last.fm. The first explains what it is and why you should be there (and probably already are!):

http://www.passivepromotion.com/lastfm

The second details the results of my three paid Powerplay campaigns:

http://www.passivepromotion.com/powerplay

Hope you find them useful!

Brian.

COLOR THEORY
electronic indie piano pop

Brian Hazard = Color Theory
colortheory@colortheory.com
http://www.colortheory.com