We've updated the main UMA architectural diagram, replacing the original UMA-specific terminology with OAuth names. In the process, the diagram also went from being a circle to being a "marvelous spiral". You can find several varieties of the diagram on the Attachments page. Thanks once again to our Graphics Editor, Domenico Catalano, for his excellent work.
The purpose of the UMA Work Group (charter) is to develop specs that let an individual control the authorization of data sharing and service access made between online services on the individual's behalf, and to facilitate interoperable implementations of the specs. Read thespec, join the group, check out the implementations, test your interop, get involved!
October 19: Eve presented on UMA to the XACML TC. Check out the slides.
October 19: Check out this YouTube video of our Google Tech Talk from Feb 2012, demoing selective Alice-to-Bob sharing through Bob's OpenID Connect claims. Thanks to Maciej Machulak for getting this published!