There are all kinds of shortcuts you can use in Photoshop. Here's a little preview of what you'll see at 11amdesign.com:

Pressing Tab will hide tool bar and palette. Shift+Tab will hide only palette.

Hold Shift + click the top blue bar for toolbar. Palette will move them to the nearest edge.

Double click the top blue bar, on any palette window, to minimize it.

 

If you want to straighten an image that is crooked (maybe from scanning), click on the eyedropper tool or hit the I key 3 times to get the ruler. Click on the left side of the straight edge, then the right side of the straight (but crooked) edge. The choose Image> Rotate Canvas> Arbitrary, Photoshop will give you the degrees of rotation you just click ok.

 

Pressing Tab will hide the Tools palette and any other palette that you have on the stage. Pressing "F" will change between Full Screen modes. Using these two tips you can view your work Full Screen without any palettes. (You can press CTL+Alt+0 to fit your work to the screen, or you can press CTL+0 to zoom to 100%)