The loss of hierarchical menus in Dock folders was a huge step backwards for Leopard. Stacks is a waste. Quay to the rescue.

I had the hardest time getting Quay to work, however, because I kept trying to click-and-hold on the Quay-installed folder I put in the Dock. I expected the old Tiger-style behavior: click once to open the folder in the Finder; click-and-hold to get the hierarchical menu. With Quay, you simply click once to get the hierarchical menu, or double-click to open the folder in the Finder. It's simpler that way -- and more intuitive, unless one is used to doing it differently in the previous Apple OS.