Just got this email, I have a feeling it might be Windows Live Messenger, whatever it is I cant wait! 😀

Thanks for signing up. We understand how excited you are to get started, and we want to get going, too. We’re working as fast as we can to figure out the best way for us to get your feedback. We know the waiting is the hardest part, but soon we’ll be sending you an invitation for a specific Windows Live beta—and that will make the wait worthwhile.