I haven't used mine much, but I'm pretty sure I've "scrobbled" all the songs I've listened to on iTunes and my iPod. I'm not really sure, haven't gotten into this site too much.
EDIT: Haha, I just accepted a friend request from someone who sent it back in February. Yeah. Turns out she's since been banned. Too bad.
Another EDIT: I joined March 25, 2007. Just for the record.