Free updated ebook: Understanding Microsoft Virtualization Solutions (Second Edition)
Mitch Tulloch has updated his free ebook and it now covers Windows Server 2008 R2.
You can download "Understanding Microsoft Virtualization Solutions, From the Desktop to the Datacenter" from http://download.microsoft.com/download/5/B/4/5B46A838-67BB-4F7C-92CB-EABCA285DFDD/693821ebook.pdf
Patrick Lownds