Web based music player

Anywhere.fm lets you upload your music collection onto their site and then play your music anywhere from the web. They offer their own iTunes look-alike music player through which you can play your songs. The site also incorporates social networking aspects, allowing you to create your own profile and discover new music through Friend Radio. I have used it and have found it awesome. I think when the ubiquitous network connection problem is solved, this service can be mainstream.