Thanks Mike, and great job publishing this info!

http://blogs.msdn.com/mikester/archive/2008/05/30/using-the-hyper-v-integration-components-in-winpe.aspx

This post details how exactly to build a WinPE disk with the Hyper-V integration components build in.  You can bet Kevin and I will be working over the next couple of days to build this in to our deployment labs.