I would love to see an analysis of the artists I listen to on spotify. Last.fm tracks all the songs I listen to so someone would just need to scrape that, find info on each song/artist, and make some nice charts. I'd love to see which artists I listen to that are very small/unknown and send them a thank you.
Just after New Year I got some email from Spotify about looking at stats for exactly that kind of thing, it required giving access to a 3rd party (which I revoked immediately after), which suggests to me that it's all data that you can grab from the API.
