Primarily, I want to be able to build up a recommendations system using the last.fm api. A way to do this would be to take the set of artists a user has saved, then take a big swath of all the users that have shouted on those artists. Then you can check & make sure they've actually saved those artists as a way to filter our & make sure that they're not being haters. Then, you start building the recommendations list based upon all the artists they've saved. From there you could actually build up suggestions if you take a large enough swath. It'd be fun to compare our similar items built up that way with the similar artists figured out by Last.fm itself. A cute application of last.fm bindings might be to provide a command-line app that would grab all the events of bands you've saved given your un on the command line.