I managed to make my dock invisible by deleting the appropriate png files from System/Library/CoreServices/Dock package and love the new look, but I still have one little problem. While the dock might be invisible, when I have an app which takes up a large area of my screen which means the bottom sits close to the top of the dock,(e.g. Safari/iTunes) an ugly reflection is seen in the dock. (see left pic) Is there anyway to disable this mirroring/reflection effect? At the moment I just resize the windows to sit further above the dock and decreased the dock size, but since screen space on a 13.3 Macbook is limited as it is, I would prefer to get rid of the mirror effect all together and go back to having my app windows sitting hard against the dock.