A great little white paper on planing a virtual machine manager 2007 deployment has been made available here:

http://www.microsoft.com/downloads/details.aspx?FamilyID=3e674bc0-bb85-47ae-b73d-f5bc515f1006&DisplayLang=en

It is actually quite pithy (for a Microsoft white paper) and is focused on identifying what you need to do before deploying SCVMM, alerting you to any potential deployment blocking problems (and informing you how to handle them) and letting you know the key features of SCVMM.

Cheers,
Ben