All your Music, Anywhere on Earth
Free (for now?????)
Stream your music to "any" web browser

The app(web based/java) lets you set up a huge playlist of music, and serve it up right on your profile in a miniplayer(WMP,Winamp, iTunes)Anyone who comes by your profile can then get the full quality versions of the tracks streamed in whatever order you set up. Uploading and rearranging tracks is all managed at MediaMaster's site.

Streams to many portable devices too-palm, windows mobile, etc
Check it out Here