I've been using the Windows Live Mail beta (the next version of Hotmail) for about a week.
I'm not a lone beta tester, as Ben Poon, the WM Live beta program manager points out:
"You have more than 3,000,000 neighbors! In an effort to get as much feedback as possible, we’re inviting more and more users onto the beta daily. Click that feedback link! Post a comment on the blog! That’s all you gotta do to get your voice heard and to shape Windows Live Mail for hundreds of millions of users who will be coming after you. Talk about power! And to those of you who have provided feedback already: THANKS!"