I used to post these on Facebook as Notes, but since the Timeline refactor, I frankly have no idea how to use Notes; so I guess I'll just post on my own blog. I use last.fm (me) to track my music-listening habits (and sometimes for other things). As of some time recently, I've passed 60,000 scrobbled plays since 2006. Yay!
Here's a graph I made (click for ps version; gnuplot continues to be the best thing ever):