I simply love my music, and always on the look for new bands. Being a member of last.fm for a while, I discovered a lot of unknown, great bands such as M83. And today I found out that pandora.com (thanks to techcrunch,an interactive internet radio, switched from being a paid service to a free service.
You just give in one band you like, he starts playing songs in the same genre you decide if you like the song or not. Great for discovering new bands. It would be great if they had a supporting community like last.fm.
I love their flash application.