I recently posted a screencast of an integration between Microsoft AppFabric Access Control and Microsoft Codename "Dallas" here on Channel 9. This was my first project in CST, and took about three weeks to implement. Producing the screencast and packaging the code as an example, soon to be posted on Microsoft Code Gallery, took another week. It was an interesting and educational exercise, as it touched on several technologies that I didn't know much about before the project. Both Access Control and Dallas are intuitive and easy to use, with REST based APIs. I'm looking forward to more work in the areas of access control, identity federation, trust delegation and web data management.