One of the devs on the TFS data warehouse team has just started blogging.  He plans to blog "how to" and conceptual explanations around the warehouse for a while.  He posted his first blog post yesterday.  It is an overview of 4 of the TFS warehouse perspectives and explains when you would use each one and demonstrates building reports against them.  Check it out!

http://blogs.msdn.com/teams_wit_tools/archive/2007/04/30/understanding-the-tfs-cube.aspx

 Brian