Wrote this tool when I was setting up my laptop to run Hyper-V.  I didn't want to have to open the Hyper-V manager and have a window running all the time, and was planning on using Remote Desktop Client to connect to the VM's so I could map drives and copy/paste in teh VMs.  The idea was to have something that sits in the System Tray that allows you to Start, Stop, Save State, and Pause the VMs running on the box.

I did some looking around as I had no idea how to manage Hyper-V programmatically.  Luckily, some blogs were around that indicated WMI would be the way to go. 

With that, I dug in.  The files are attached and feel free to do with them what you want.  Zip contains 2 folders.  Compiled EXE is in the Hyper-VManager folder.  The Visual Studio 2008 project is in the Hyper-VManager_Source folder.

When you launch the app, you will get a UAC prompt.  The app needs to run with admin access to get to Hyper-V objects.  You get the same prompts opening the Hyper-V MMC.  Here's a quick break down of the app and what it does.  It currently manages a single machine.  You can manage a remote machine by changing the .config file entry.  Change \\.\ to \\MachineName\ and you should be good to go (considering you have permissions to the remote machine).  You could extend the app to manage multiple machines, but would need to tweak the code to handle building out the appropriate menus.  Shouldn't be much code, but considering I'm not going to be using it, decided not to do the work :-)

When you launch the app, it displays a Hyper-V icon in the System Tray: