I've seen a few questions lately about configuring TFS with MOSS.  The official MSDN documentation isn't quite ready yet.  In the mean time, Jon has written a blog post describing the steps necessary to configure it.

http://blogs.msdn.com/team_foundation/archive/2010/03/06/configuring-sharepoint-server-2010-beta-for-dashboard-compatibility-with-tfs-2010-beta2-rc.aspx

Brian