Patrick Harding of Ping Identity has written an article on SAML 2.0 for Network World. It's a useful resource, describing both the SAML 2.0 specifications (at a high level) and the convergence of standards and specs that led to them. However, it's a little strange that Patrick makes no mention of WS-Federation, especially since Ping support WS-Federation in a number of their products.
Why so coy, Patrick???