Office Communicator Web Access AJAX Service SDK 1.0

Microsoft has released the Office Communicator AJAX Service SDK 1.0 including the following sample applications:

A simple instant messaging (IM) client written in JavaScript.
A simple instant messaging (IM) client written in C#.
A C# application that receives events from Communicator Web Access and displays them, as well as the methods that are being sent to the server, in JSON format.

You can find it here