A Great Permissions Explanation...
I messed around with the permissions in Beta1, and have started to in Beta2, to try and understand what permissions and groups you needed to be in, to be able to do different things with Team Foundation. Specifically, what kind of rights do you need to be able to create a team project. Needless to say, it was mostly a hit and miss affair, and I haven't put a whole lot of work into it.
Well, Mike Attili has, and he has put together a great post Simplify Authorization for Team Project Creation. He explains what types of authorizations make up the current Beta2. As well, he gives you a step-by-step guide to setting up a group in your AD, so that members of that group can create projects in Team Foundation. This is an especially cool thing to do, since ADAM will not be in the final release of VSTS.
(Thanks to Buck Hodges for the link to this post by Mike)