We have installed TFS 2010 with success but wonder how to set the users permissions. We are small projects with five developers, a manager and a secretary. Each developer is
See the workaround I posted here - Adding Active Directory users to Team Foundation Server
It will allow you to add users to your TFS 2010 project without having access to the remote domain (useful when you have remote developers or when your Team Foundation Server is remotely hosted.)
The steps include details about adding new users to your project groups.