Expose Dock Feature

This very useful new feature of Expose and the Dock was missed by many who upgraded to Snow Leopard. If you want to see all the windows of a running application, just click and hold on its icon in the Dock. After a second, Expose will activate and show you the windows of that application. Then just click on a window to bring it to the front. Or, click again on the icon to return to how you were.