You will find here 3 posts about Visio 2007 most wanted new features : the PivotDiagrams.

Part 1 : http://blogs.msdn.com/wmorein/archive/2006/06/22/643198.aspx

 

Part 2 : http://blogs.msdn.com/wmorein/archive/2006/07/10/660756.aspx

Part 3 : http://blogs.msdn.com/wmorein/archive/2006/07/29/682979.aspx