As Federated Identity starts to take off in the Web Access Management market segment, there are a number of standards bodies that you need to stay in touch. Of course, the manadatory OASIS and Liberty.org projects are great. I am specifically impressed with the standards validation that the Drummond Group did on behalf of Liberty Alliance Project. See the full report here.
Additionally, Eve Maler–XML Girl–facilitates a project called Concordia. This project is focused on driving interoperability between the differrent standards bodies. This built out of a passion and tremendous experience that Eve brings to the table as she has worked on behalf of Sun within the Microsoft partnership on interoperability. There is some great work that has come out of that and you can read about it on Eve’s Blog here.