Audioscrobbler is a site that
"builds a profile of your musical taste using a plugin for your media player (Winamp, iTunes, XMMS etc..). Plugins send the name of every song you play to the Audioscrobbler server, which updates your musical profile with the new song."
They also have charts that show what exactly is being listened to by the collective mass of their users.
With Teeth happens to be dominating that chart - with
The Hand That Feeds being the most popular.
Thanks to everyone that sent in this awesome news.