It's simply not very affective. If you have tons of apps running it takes several seconds to find something in the dock. The snap shot of the window when you minimize it is pointless, you just see a white square unless you have magnification on, which I never have. I must addmit I don't have any brilliant ideas on how to change the dock to make it better, but maybe you do. post some cool ideas on what to do with the dock to make it kick-ass.