We had a question regarding the whereabouts of the OCS Deployment Validation Solution document. I found it with a helpful hint from Rui by downloading the 2007 version of the tool - DVT.MSIT - http://www.microsoft.com/downloads/details.aspx?familyid=3596A10D-65CC-4CCA-8470-3F23D5EA55B2&displaylang=en
Choosing the default location the doc was found at C:\Office Communications Server Deployment Validation Tool\OCS_Deployment_Validation_Solution.doc
The tool did not change between versions that I am aware of but do watch this space for updates as we find them.
Update June 24 via comment from Richard at Geomant - Hi Tom, if you are looking for the R2 version of DVT, it is already included in the R2 version of the OCS Reskit tools. I dont know, what changed since the R1 DVT, but it is definitely a good idea to use the more recent tool. Richard