You can now use Information Cards at Hotmail and all the other MSN/Windows Live sites.
Just go here to associate an Information Card with your existing account. I found that both Windows CardSpace and the Mac DigitalMe information card selectors worked beautifully with the system. Check out this video to see what it was like registering and logging in from my Mac using DigitalMe.
It's worth taking a step back to think about what can go wrong when you add a feature of this importance to a site with 300 million accounts. If things don't work, you don't have a software bug – you have a trainwreck. So the Windows Live people have done a lot of thinking, planning and testing in order both to create a cool experience and keep from confusing their users.
There are still some anomolies. In the words of the Beta announcement: Continue reading MSN and Windows Live CardSpace Beta