Above links not working:
PicketLink 1.0.2 is released. News is http://anil-identity.blogspot.com/2010/02/picketlink-v102-is-released.html.
Look at the above link for:
http://community.jboss.org/wiki/HowtoaddSAMLandOpenIDauthenticationtoyourSeamapplication (How to add SAML and OpenID auth to Seam apps)
http://community.jboss.org/wiki/ExternalauthenticationexampleusingSSOCircle (SSOCircle is the external IDP example)
http://community.jboss.org/wiki/ExternalauthenticationexampleusingOpenSSO (OpenSSO is the external IDP example)
Additionally, http://community.jboss.org/thread/148056 (PicketLink's Seam Module V1.0.2: many new features!)
Fixed the links for you :)