EDIT 2/15/2010:
Microsoft System Center Capacity Planner (SCCP) is formally being discontinued. The most recent version, SCCP 2007, is no longer available. No new versions of this standalone...
Updated Jul 01, 2019
Version 2.0
Blog Post
I had not used previous versions of this tool, but I just ran the latest. WOW!! cool visio integration too! that will really save me time (I think)