Have you been wanting even better performance and scalability?  How about being able to host custom controls on your WIT forms? Maybe you really want a more detailed merge history?  Well, we now have it.  You can download and install the TFS SP1 Beta from the Microsoft Connect website.  Read more about what's in the Service Pack in Brian Harry's blog: http://blogs.msdn.com/bharry/archive/2006/09/26/772371.aspx