As a new user of Evernote, I was saddened to see that stacks can't be shared. Sharing of stacks would certainly be a great thing. Yes, I can change my naming conventions, but having to go through all of my notebooks that are already in a stack, just to share them, is usless work. They should automatically inherit those rights as well. As I make a new notebook in that stack, it should automatically be shared. Hope it happens soon!