Read this blog post by Vittorio Bertocci, one of our Windows Azure AppFabric evangelists, regarding the most recent updates to the Identity Developer Training Kit and the first release of the MSDN-hosted Identity Developer Training Course.
If you are already using the Access Control service, or would like to get started, these would be very useful resources.
You can start using our CTP services in our LABS/Preview environment at: https://portal.appfabriclabs.com/ to get a feel for the features and enhancements that are going to be released soon. Just sign up and get started.
You can also start using our production services free of charge using our free trial offers. Just click on the image below.