If I'm browsing the web and want to do something in another app, say iTunes, I click its icon in the dock and the iTunes window gets the focus. If I want to go back to Safari, using only the trackpad, I have to move the pointer back over to the Safari icon and click on it. How cool would it be if all I had to do was click the iTunes icon again to have the focus returned to the previous app I was using by hiding or minimizing the current window? This would effectively turn a dock icon into an on-off button for a given app's window(s). As it stands now, clicking the icon of an app that already has focus does nothing....why not give that click a function or at least make it an option? I do a lot of my work in full screen windows, so this would be nice. I seem to recall Windows doing something similar. Anyone seen an app that could make it happen?