""Future of Music (2010)" is a Mac OS X app that scans your iTunes library and computes the music you are not supposed to listen to anymore based on your preferences. It then helpfully deletes it from iTunes and your hard drive. Skips the recycle bin. Just like other recommender systems, it uses a lot of fancy math (and data from Echo Nest and last.fm) that really doesn't matter in the end. Just click the button and let it take care of your life."

Ooh, this looks like a very interesting write-up of a thoughtful SXSW session. Marked as something I need to follow up on.