After posting about this last week - Tore has been working hard and has now release version 4.1 of his Hyper-V Monitor Gadget.  Key changes include:

• Added new server manager for easier management
• Added a Large size (undocked) theme with larger font
• Clicking on a host now starts Remote Desktop to the host
• Clicking on the Hyper-V Monitor title starts the Hyper-V Manager

Here is a quick picture (from Tore's site) that shows you the small and large view of the gadget:

You can go and download it from here: http://mindre.net/post/Hyper-V-Monitor-Gadget-for-Windows-Sidebar.aspx

Cheers,
Ben