Andy Dale recently posted a great entry titled “ Adopting Evolution ” in which he asked the question: Why has OpenID grabbed so much popularity while SAML, a much more mature, academically respected, ‘robust’ specification has been largely ignored by the cutting edge web 2.0 community? I’ll encourage you to read his post for his insightful answer. His question reminded me of another answer to the same question that I gave during the recent Concordia meeting at DIDW: OpenID solves the “Home Realm Discovery” problem that all Federation protocols face; that is, figuring out where the person’s authentication information should come from. Read More...