I’ve had a love/hate relationship with Lab Manager so far. It has been a great tool for our developers, but it is not a complete solution. It wantonly wastes storage (its primary constraining resource) and it make server maintenance much more of a chore than necessary. I stumbled across this good blog on it now, of course, as it enters its twilight. Hopefully good information on vCloud Director will be forthcoming.
http://bsmith9999.blogspot.com/2011/03/lab-manager-4.html
–Nat