Although I’m not using TFS (I hope to be very soon), these Sidekick products (Version Control and MS Build) by Attrice look very interesting. From what I can tell on the website both products appear to be free for use in both commercial and non-commercial situations. They even have the source code available if you want it. Check out the blog and subscribe to the rss to be notified of releases.
I’m the Igloo Coder and my sidekick is out to lunch.