I joined an Open Source project over at CodePlex, recently. They use TFS for their source control and I have to say that it's absolutely magnificent. I'm incredibly impressed with it, so far. I'm a huge fan of the IDE integration and how easy it is to branch and tag your code. Adding a solution to source control is something like two clicks, if you've already got everything configured properly.
Now. Is it worth the hefty price tag? I don't think so. The benefit to working on projects at CodePlex is it lets me get the experience with TFS that I need, in the event that I have to use it somewhere later. If you want good IDE integration for your Source Control, go grab VisualSVN integration package. It's a much, much cheaper investment to get a lot of the same features (free on non-domain computers BTW).
