Jamie Laflen and Barclay Hill wrote a great, must read article for MSDN Magazine, detailing the Visual Studio Team System 2008 Database Edition GDR functionality. Besides that it has a great intro describing the base principles of offline database schema development.
Check out MSDN Magazine March 2009
Database Development Introducing New Features In The VSTS Database Edition GDR http://msdn.microsoft.com/en-us/magazine/dd483214.aspx
Enjoy the great read! -GertD