Last.fm is inviting subscribers to test the new Last.fm beta. Features include a fully visible library down to individual tracks and charts updated in real time. People seem to dislike the new visual design. There's more discussion at the Last.fm beta group.
Last.fm isn't just for humans. Matt Biddulph, a systems architect for the BBC, rigged a homemade plug-in for Last.fm (Previously on MeFi) that, over the course of a year, transmitted over 50,000 songs played on BBC 6Music to a Last.fm account named Sekrit. (Oh, and wondering what MetaFilter users listen to?) (via waxy)