I stumbled across this interesting and extremely useful Hyper-V Monitor gadget the other day. In a very compact workspace on the Windows Vista Sidebar, it shows you the status of every virtual machine configured on a Hyper-V Server and allows you to connect to or control any of those VMs with a single click. In the example shown here (which shows my live Hyper-V Server), I’m actually aiming the mouse pointer at the status section for the first VM in the list, making the the Turn Off, Shut Down, and Save buttons visible.
The gadget can list multiple servers at once and can save a custom username/password pair so you can log on with something other than your current account credentials. Each VM in the list is a live link; click to open the VM in a Virtual Machine Connection window.
Developer Tore Lervik has more details and the latest downloadable code: Hyper-V Monitor Gadget for Windows Sidebar.
Ed Bott (@ wordpress.com) 
Great find, I am using Hyper V a lot at the office and that will be very useful