Well I wanted to test this thing out. Listianing to the folding@home music. Also I added my PS3 F@H team to cf. Anyway, off to see how Youtube.com looks.
Xbox Live doesn't have a browser. Nor does it need it because it's supposed to be a console.
That being said, I've played with both XBL and PSN and I can easily say that Sony has a lot of work to do before they're even close to competing with Xbox Live.