Discover, Create, and Subscribe to original audio content for your iPod or MP3 player

much joy: 4.5 is out with a ton of new features

Leechster is a small Cocoa application for Mac OS X 10.3+ that will download songs via Apple’s iTunes Rendezvous music sharing

submits play counts and rating to return recomendations

Remote control for iTunes

An online directory offering GarageBand musicians a forum to share their songs and loops.