Well, this has been a slightly unusual week! Two meetings with some guys from Sun where we've been looking at the pleasures of interop between Liberty and WS-Federation to some degree. Having the Sun guys in our building was certainly a novelty and it seems Robin even took away a souvenir from the visit - really nice guy but not sure about his fashion sense ;-)
We were tempted to ask the security folks to take them to a side room with a high-intensity lamp and uncomfortable chairs... perhaps next time? :-)
In fact, we had a great meeting thanks to everyone's professionalism and passion to make this exercise a success for our customer. If you are interested in this area the Web SSO Interop Profile and the Web SSO MEX Protocol which we've recently published with Sun may be worth a look? The Web Services Specifications Index may help if some of the acronyms aren't immediately obvious!