Some customers are having trouble with snapshots in Hyper-V. I recently had the opportunity to discuss these issues and best practices to avoid them with Ben Armstrong, a.k.a. Virtual PC Guy
Click the image to view the 12 minute video on Showcase (not to be confused with my old team – IT Showcase…but I digress).
Read Ben’s blog at http://blogs.msdn.com/Virtual_PC_Guy/
See also the Hyper-V Snapshot FAQ at http://technet.microsoft.com/en-us/library/dd560637.aspx