The documentation for the team build 2008 object model is now available as a CHM file.  Later this year, I'm told that the MSDN web site will be updated.

http://download.microsoft.com/download/5/f/8/5f872c2e-4221-410b-b86e-4c3cd831b0c4/Team Foundation Build Managed Reference.chm

After you download it you will need to right click it, choose Properties, and then select “Unblock” before you can view it.

This documentation is newer than what Aaron posted back in August.

The following are posts with examples of using the 2008 object model.