I might as well start this blog off with an error message that I encountered today. :)

Reinstalling TFS 2008 (mostly) form scratch in a dual server configurations. Installation hiccups about 3 minutes in.

Check the log files and find:
Detailed Message: TF213000: A required user account could not be added during installation or repair of Team Foundation Server.

Notice that I said it was only mostly from scratch? Well, it turns out I still had Team Explorer 2008 with SP1 applied to it. Uninstall that, restart the TFS 2008 installation and everything was kosher.