I came across a couple of good articles that consolidate music website information - music recommendations, independent music, creating playlists, search engines, mix and share. Not exactly on topic, but interesting.
check it out: http://www.techcrunch.com/2009/08/22/your-guide-to-music-on-the-web-part-1/
http://www.techcrunch.com/2009/09/26/your-guide-to-music-on-the-web-part-ii/
