http://avirubin.com/passport.html Excellent, technical paper by AT&T Research Labs describing the many risks of Microsoft's centralized Passport authentication system. http://slashdot.org/comments.pl?sid=01%2F08%2F05%2F0011215&cid=&pid=0&starta t=&threshold=-1&mode=thread&commentsort=3&op=Change Slashdot comments on the subject