Microsoft's push into the world of Unified Communications continues with the launch of the Unified Communications Developer Portal. This MSDN portal is part of the Office Development Center, and is designed to feature links and resources for developers wanting to get into UC.
As I write this updated post, there some interesting feature articles, including Detecting the State of the Office Communications Server and Building UCMA Installers.
This is a great site for developers (and admins that secretly want to be developers!) to learn more about developing in the UC space.