I have some great news. The FIRST System Center Virtual Machine Manager book is now available at major book retailers like Amazon.com. This book was primarily written by Hector Linares and myself, with Cheng Wei being a contributing author. The book covers VMM 2008 R2 and all its new and existing features.
You can check it out here: http://www.amazon.com/Mastering-Virtual-Machine-Manager-2008/dp/0470463325/ref=sr_1_1?ie=UTF8&s=books&qid=1260507554&sr=8-1-catcorr#noop
I hope that if any of you buy this book, you will find it a valuable aid in understanding VMM in-depth, seeing real world examples of how to use VMM through PowerShell and PRO, and getting the scenarios nailed for a successful virtualization deployment.
Having the first book out on VMM shows the maturity of our product and how far we have come since 2005 when we started working on virtualization management :)