I was playing around with a recent update to Quest's PowerGUI (188.8.131.52) and I'm really liking how it's coming along (make sure to watch Jeffrey and Dmitry's video if you haven't already)
I was kind of hoping that by now there would be a PowerGUI extension for TFS, but no such luck as of this writing. Sure, there are ones for Exchange, AD, SQL Server, even MOM (!) but no love for our friend TFS. I'm hoping that will change soon!