The sites I've tried or experienced as a listenner:
https://soundcloud.com/
http://www.soundclick.com/
http://www.kara-moon.com/
http://ca.myspace.com/
http://www.lastfm.com/
http://www.reverbnation.com/
http://bandcamp.com/
http://archive.org/details/audio (good for hosting mp3s)
http://mp3.com/ (is back!!!)
http://www.mixcloud.com/ (usefull to embed songs in a player and put on your personnal website)
http://freemusicarchive.org/ (good to give away your music for free and promote yourself furthermore)
http://virb.com/
http://www.jamendo.com/
The sites I haven't tried nor experienced as a listenner:
http://www.purevolume.com/
http://www.ourstage.com/
http://www.thesixtyone.com/
http://www.muziboo.com/
http://www.unsigned.com/
http://official.fm/
Any suggestions or sites worth mentioning? Let expand the list!
