Found this free ebook while surfing: "Understanding Microsoft Virtualization Solutions: Second edition" which updated for Windows Server 2008 R2.
The ebook included with six chapters:-
Chapter 1: - Why Virtualization
Chapter 2:- Server Virtualization - Hyper V
Chapter 3:- Local desktop virtualization - App-V, MED-V, XP Mode
Chapter 4:- Remote desktop virtualization- App-V on RDS, VDI, RDS
Chapter 5:- Virtualization Management - VMM
Chapter 6:- Cloud Computing
480 pages is worth to have. Please go to http://blogs.msdn.com/b/microsoft_press/archive/2010/02/16/free-ebook-understanding-microsoft-virtualization-r2-solutions.aspx to get the ebook in xps or pdf format.