Because it still does exactly what I want it to do, and what I've wanted it to do since I signed up in 2004, which is keep logs of every song that I listen to. The user-generated content side of it was added after I signed up (I think?) so I don't see how I could really miss it.

230K songs since 2004. http://www.last.fm/user/ryxxui

You might be interested in https://libre.fm/ if you aren't confident about the future of Last.fm. It can be used as a drop-in replacement to track your music plays.

I'm annoyed that I didn't keep using it consistently. I even had it tracking usage from an offline iRiver H340 MP3 player - at the end of the day, I'd upload a database from Rockbox.

http://www.last.fm/user/voltagex

173K Songs since Nov 2004. http://www.last.fm/user/GurnB But I took 4 or 5 years off.

I should said "it was" one of my favorite sites. The redesign is awful. They killed the neighbors feature which was really fun.