Well, I joined a couple of days ago.
Here's my profile:
Cananito’s Music Profile – Users at Last.fm
I really liked it, all that recommendations and everything, I tought downloading the software and running it while I use itunes would slow down my computer, but it doesn't it runs good.
I wanted to try pandora also, but sadly it's just for usa, so I couldn't join, lasft.fm seems aswome anyway.
Oh, and also the iphone/ipod touch app is aswome too.