After a couple of months of beta testing and some intense development, Toby has just released version 2.0 of Musicmobs. Using Musicmobs you can upload your play counts from iTunes and get recommendations. The new version also allows uploading of playlists. Here is a list of my playlists. The site has an all new design and a much cleaner and more modern interface. An API will be released soon, which will allow people to write their own views, like a cloud or gradient.