This is perhaps the greatest thing to happen to the Xbox, Xbox Live!, and Microsoft as a whole. Simply amazing looking and I can't wait to use all of those features tomorrow. Thank you Microsoft and the Xbox Development team for listening to your gamers/users to make the Xbox 360 experience richer than it has ever been.
My Xbox 360 is used for nothing but streaming stuff to the TV, something it does rather poorly. Especially when it comes to keeping video aspect ratio etc. I think this is a good move by Microsoft. Making the Xbox into something more than a pure gaming console will increase extend it's lifetime within the realm of usefulness. I'm hoping they will improve the streaming options/controls as well. And as always, I keep hoping we'll see Skype on the Xbox one day.