Online radio, as it should have been created

I'm experimenting a new kind of online radio for about two weeks. It is called Last.com. I've first read about
it three weeks ago in a Wired article.
The principe is simplistic but truly great :

• you create an personal account


• you log in and you get a mp3 stream (works with xmms) and a javascript auto-refreshing window : you can see on this window what you are listening (their mp3 doesn't yet send title UDP packet). And if you don't like what you are listening, you just change click on javascript window to say "I don't like this, change" (or you can also change even if you like current track.

Last.fm system will learn your musical taste and will progressively serve you music you'll probably like. Then, you can find people who have the same musical taste as you and listen to their stream.. At any moment, you can access all streams you already listened to, to get more
info, order CD from Amazon and so on.
For old web users, this will probably remind you of Firefly, before they were bought by Microsoft.
In short, it is THE online radio I've been looking for a very long time.
Try it, you'll love it.