Memolane is a lovely new web app I played around with recently that trawls through your social history and displays it in an interactive timeline. It has one or two nice features, such as the ability to open Last FM scrobbles directly in Spotify. It will be interesting to see how this data will be used in future, especially if they are releasing an API to all of this data. Could produce some pretty amazing mashups. Memolane is in beta, but you can use the code ‘scobleizer’ to register.