Catherine Heller has posted a very detailed how-to on implementing the new web-auth for Windows Live ID...as soon as I have a little extra time, I'm going to play around with this, in case I need it for http://www.madcodecamp.com/. 

Windows Live ID Web Authentication

By now, I hope you've heard about the recent release of Windows Live ID Web Authentication.

If you haven't, here are some links you should check out:

Be sure to read the whole post...good stuff!

"A la Vista" : Windows Live ID Web Authentication and the ASP.NET Development Server