We just published updates to the Team Foundation SDK, which now covers the server object model. We're making some other changes, too. Of course, we're adding more content to the reference material. For example, we've added information that we think you'll find useful in Microrosoft.TeamFoundaiton.WorkItemTracking.Client Namespace, including a code snippet to help you get connected to a work item store. At the same time, we're removing content that's not all that valuable.  Extending Team Foundation and Extending Work Item Tracking used to have a lot of verbaige that primarily served the purpose of meeting some conventions that we have, rather than making it easy for you to use the topic. That's been removed. In Extending Team Foundation, we also pulled up some relevant reference links alongside the links to conceptual topics, like this:

Bugs, tasks, and other work items

Let me know what you think about these changes by leaving feedback on the topics on MSDN, or by leaving a comment here on this blog.

Allen