Now you can scrobble and <3 the music from your ridiculous Google Music collection into last.fm.
You'll need Gresemonkey if you use Firefox (https://addons.mozilla.org/en-US/firefox/addon/greasemonkey/)
You should be able to just install and run the script if you use Chrome (no extensions required).
I don't know about Safari, and Opera has that user.js thing which I forgot how to use. But, it's probably possible.
Oh yeah, and if you want to check out my last.fm: http://www.last.fm/user/omiethenull