I've been using last.fm to keep track my music (listening) habbit. It has a great statistics. Love it soo much. But things have been like that for ages. There's no new thing.
Recently, there are several applications that can keep track of your life by asking you to "check in" manually or automatically. The interesting thing is that they reward you for checking in. For example, in getglue you'll get stickers after several checkins. In other places you get points, rewards, or ranks. This is missing in last.fm.
Last.fm could update their site by providing ranks (people who use last.fm frequently) or group people with the same interest(s) - say if they have more than 90% match - in a special group. They can even rename their group to a cooler name. This way we can find people with the same interest and perhaps learn new artists or bands from the rest of the group.
Lots of ideas are still available if last.fm is interested. Or, maybe last.fm is a dying service? (They shouldn't since they're so useful.)