Wallop is a alpha program the Microsoft Team has started allowing people to upload music (mp3) pictures (jpg) and have a blog online. You can only get in with an invite and once in you get invites to invite your friends. The top 14 people in your network can listen to each others music. If you invite more than 14 (I've invited over 50) then you can float them in and out of you network.
If anyone is wanting to try this service send me a pm with their Name (or screen name) and a Email account address where the invitation can be sent.