Hyper-V Program Manager
I have posted about this in the past - but Tore Lervik released a new version of the Hyper-V Monitor Gadget for Windows Sidebar last month. This is a tool that I have installed on all my desktop computers and am hopelessly addicted to. Recent additions to the gadget include:
Go here to check it out: http://mindre.net/post/Hyper-V-Monitor-Gadget-for-Windows-Sidebar.aspx
Just released a patched version of the gadget this morning. Some people had problems with the RAM amount taking up two lines, this has been fixed in the latest version.
Great! That bug had been happening on my machine - glad to get a fix :-)