I think this Live thing looks like its going to be really good. Once Live.com, Mail and Messenger all come together things are really going to get going. I just hope that "Firefox support coming soon" means with in the coming week or so.
I am hoping to see some Channel9 videos with some of the Live developers. We have already heard from Live.com (start.com) and mail - now all we need is to hear from the messenger guyes and perhaps the CareOne team.