Check out this post from the UC team regarding some virtual labs you can use to try your hand at deploying OCS 2007, Exchange 2007 Unified Messaging, etc.

http://blogs.technet.com/uc/archive/2007/07/21/new-microsoft-office-communications-server-2007-technet-virtual-labs.aspx

Does three posts today count as a trifecta or is more "three on a match"...