W2K8 is Breaking the 5K Folder “Barrier” in Domain-Based Namespaces
http://blogs.technet.com/filecab/archive/2007/07/24/new-in-windows-server-2008-breaking-the-5k-folder-barrier-in-domain-based-namespaces.aspx has the details of something I know a lot of organisations have been wanting for a long time.