IIts been a long wait. After working with customers for getting out their token service and doing all the claim based black magic, finally we have a framework. Its not a bubble gum and match stick situation more and its a full framework.
If you want to build applications and solve your federation problems which i have had a lot of previous posts on then you really want to take a look at this. Vittorio is put up quite a cool set of links and a very neat overview which I don't want to cut paste here.
I still remember working with Vittorio and Martin in getting up the STS during the indigo beta days .. nice to see this out which really makes it easy to get your security around your solution. I would like to emphasize on the fact that claim's based approach is a security solution and not just an approach. The spec is so rich if you have the time to digest it cause it breaks down complex problems of multi-hop scenario and delegation really simple. Transformations are another area which I am interested in and would see how Zermat solves this problems.