The Patterns & Practices team has just released some really good and pretty comprehensive guidance on how to structure your team development using Team System and Team Foundation Server.  It's going to be available in a variety of forms, including a book you can buy.  See JD's blog for more info on it: http://blogs.msdn.com/jmeier/archive/2007/08/06/new-release-patterns-practices-team-development-with-team-foundation-server-guide.aspx

 Brian