Steekr

http://http://www.steekr.com/
With Steekr you can: -Store your music ,your pictures, your videos and all your personal files online. -Play and listen to your digital files directly in your browser. -Share your files with your friends or relatives.

SoundPedia

http://http://soundpedia.com/
Listen to music online, share videos, meet users with the same interest as your and much more.

SonicSwap

http://http://www.sonicswap.com/
Share Playlists with Thousands of your Closest SonicSwap offers music playlist sharing built around social networking and collection analysis. Patent pending search technology returns playlists based on your ability to play them. Members run a software accessory called BOINK in parallel with iTunes to connect with friends through music.

Songrio

http://http://www.songrio.com/
Upload, Listen and Rate your Favorites Songrio developed a community for anyone to post the information of good, yet mostly unheard songs for everyone else on the internet to be able to see, and as well as have the ability to rate.

SongBird

http://http://www.songbirdnest.com/
Songbird is a desktop Web player, a digital jukebox and Web browser mash-up. Like Winamp, it supports extensions and skins feathers. Like Firefox,it is built from Mozilla, cross-platform and open source.