Keith Mayer tackles the challenge of locating VHDs, especially good for those who inherit virtual environments from previous admins, or just for a quick scan to see what all is out on the storage.  This post is complete with PowerShell cmdlets and scripts for making the job that much easier!

http://blogs.technet.com/b/keithmayer/archive/2013/03/11/dude-where-s-my-vhds-more-powershell-tricks-with-hyper-v.aspx