Ok, here's how the default Photoshop layout looks after opening a file. Usable, but things could be better.
Ctrl-0 resizes your editing window to the maximum size it can be and zooms your image to fit.
Pressing the F key centers your image and eliminates the windows.
Pressing the Tab key will hide all toolbars and palettes. This works in any viewing mode, but is particularly dramatic in this mode.
Pressing F yet again eliminates even the menu bar, and changes the background to black.
Notice that even though the menu is hidden, all menu choices are still available via the little arrow icon at the top of the toolbar.
Pressing the tab key hides all toolbars and palettes again. This is known as "guru mode". When you can work comfortably in this mode without having to repeatedly hit the tab key, you're on your way to guru-dom.
You can, however, still access all tool options by right-clicking with the mouse (Cmd-clicking for Mac users).
With the Move tool selected (use the V key, I remember it as moVe) you can still navigate the layers even though the Layers Palette isn't visible. Just right-click (Cmd-click).
Have you ever had a window insist on hiding behind the toolbar when you zoom? This happens when there isn't the tiniest little gap (a couple of pixels will do) between the toolbar and the edge of the screen.
Another common problem is the document window getting stuck up under the options bar. Hitting the tab key twice usually fixes this.
Speaking of the options bar, you can collapse it by double-clicking on the far left edge. It can also be dragged anywhere on the screen (or on a second monitor).
Down at the bottom of the Photoshop screen (at the bottom of the doc window for Mac users) is a display of the current zoom percentage (you can type another percentage if you like). There is also a little black arrow that will offer you your choice of information to display next to the zoom box.
Do you ever use other apps with your Photoshop images? Don't you wish you could move back and forth between it and Photoshop as easily as you can with ImageReady? Well, you can. Just put a shortcut for the application in the Helpers folder.
The app shortcut in the Helpers folder will cause that application to appear as an option in the Jump To menu. I don't have any Helper apps installed here, but if I did they'd show up right under ImageReady.