Planning Tool
We have a new OCS Planning Tool to help you plan your upcoming OCS deployment. The tool is still in beta and some of the links aren't available yet but it does provide you with a quick visio and initial sizing of your environment by looking at the design parameters you define. Download it and check it out.
You can download the Planning Tool for Office Communications Server 2007 at http://download.microsoft.com/download/2/0/7/207bb9fb-bffe-478f-91b7-8339d25f7fdd/OCSPlanningTool.msi.