Microsoft, exactly for me created a good white paper that I’d like to read:

System Center Virtual Machine Manager 2007 Scripting Guide

A very nice guide of useful script samples for SCVMM - which highlights common tasks:

Adding new Virtual Server hosts.
Configuring new Virtual Server hosts.
Deploying and configuration new virtual machines from the library.
Moving virtual machines between different hosts.

If you are working with Virtual Machine Manager, Must read!