My friend pointed me to this wonderful website today. You download a plugin for whatever media player you use to listen to music, and it logs what you listen to, when you listen, and how often you listen to it. After you've logged 100 songs on the website, a list of "neighbors" becomes available to you -- these are people that listen to similar music.
Anyway, here is a link to the website for anyone who might be interested in such a thing.
www.audioscrobbler.com
Here is a link to my stats page:
www.audioscrobbler.com/user/sonofatruckload
And here is a link to my friend's stats page, to give you a better understanding of what it looks like when you've used this thing for a while:
http://www.audioscrobbler.com/user/Steimes
Hope someone enjoys this as much as I do!
Oh, and if you sign up, perhaps post your user name so the rest of us can see what you're listening to.