This change makes it so much slower and harder to find my applications and documents. I submitted feedback about this (http://www.apple.com/feedback/macosx.html) and so have others (and so should you!), so hopefully Apple will give us back this feature. In the mean time, I think i will try this trick of replacing the 10.5 Dock.app with the 10.4 Dock.app: (http://forums.macnn.com/90/mac-os-x/351884/stacks-usability/5/#post3518834).