The Windows Live Developer Center has a new link to an MSDN Library document, "Windows Live ID Service", an overview of the upcoming replacement to Passport, Live ID. Learn about the high-level architecture, SOAP, RPC, WS Trust, and lots more! Interesting to note that Passport is handling 22 billion authentications per month (www.Passport.net is Alexa's number 10 ranked web site, globally). One of the unsung but very cornerstone features of Windows Live, this ability to handle such a massive scale of traffic sets it apart.