I was exposed to some of it when I tried out my Windows Phone 7 a few months back. I'd sign in and check now, but for some reason it's rejecting the password my IM client is using right now to access Windows Live Messenger. There was a place to upload photos, status postings, longer blog style posts, manage contacts/groups, and Messenger was used for IM style chat.

And yes, it seemed to be pretty disconnected from everything else and internally held together with a bit of duct tape. There wasn't even a way to integrate "Windows Contacts" with "Windows Live Contacts".

My comment though was mostly a friendly jab at Tony, wondering why he wasn't a Live user yet if he wanted to support something other then Facebook