One thing I really miss is the ability to create shared folder between host and guest. Virtual PC does this well, you can create Shared Folder to be used every time, or just this one. I have read some posts on how to do this. Some people suggest using ISO Creator to package up the files and mount the image to DVD drive, but what I need is truly a "shared" environment, so I'm currently looking into creating Virtual switch and creating an internal network between the host and guest. Let's see how that works out.
I would have loved to give Virtual SAN Manager a try, but I don't have a local Fibre Channel to set one up.
I guess this might be an extension to my original post: http://geekswithblogs.net/LifeLongTechie/archive/2011/05/05/windows-virtual-pc-vs.-hyper-v-virtual-machines-vs.-windows-virtual.aspx