Hyper-V Web Manager (HVWM) is a web-based management utility for Microsoft Windows Server 2008 with Hyper-V role. The web manager will eventually give you most of the functionality that is available in the Microsoft Management Console for Hyper-V.
The project is not an official Microsoft project and is not developed by Microsoft employees.
HVWM is built around the Virtualization WMI Provider.
Early prototype screenshot: