A few days ago Microsoft released a new certification exam focused on virtualization as part of its training path for IT professionals.
The exam is called TS: Widows Server 2008 R2, Desktop Virtualization [70-669] and covers multiple products, including Virtual PC (the one part of Windows 7) and Windows XP Mode, App-V, MED-V, Remote Desktop Services (RDS), the VDI Connection Broker, System Center Virtual Machine Manager (SCVMM) and Configuration Manager (SCCM), Powershell 2.0 and of course Hyper-V 2008 R2.
The exam 70-669, optionally paired with the 5-days training class 10324A: Implementing and Managing Microsoft Desktop Virtualization provides credits to achieve the certification called Microsoft Certified IT Professional: Virtualization Administrator.