The number one wow feature has got to be the ability to take "snapshots" of your virtual machines, and reverting back to them. Check out the screen shot of the Snapshot Manager below
Another cool feature, is that you can “Clone” out from snapshot.
Say, I’ve been working hard out on my BizTalk vm and have lots of my personal development files on it.
Someone comes up to me and asked for a copy of the BizTalk vm , I don’t have to give them a “dirty copy” but I could clone out a clean copy base on an earlier snapshot I’ve taken.
Now that's way cool! :)
I’ll post little cool things as I find them. (But this feature is it for me)
Now, to convince my boss to get the full version...
Update:
If you are wanting to import your MS Virtual Server / VirtualPC images across there a nifty utility to do so, which can be found here.
