Viewing and Basking in your Image
When I'm done working with an image, I like to sit and admire it (hey, I spent six hours working on it, I should). To do that, I hit the Tab key, then hit the F key three times. This hides all of the panels and toolbars and lets you see the image by itself surrounded by black. To get back to regular mode, press the F key and the Tab key one more time.