Here is a run-through of all the new Photoshop shortcuts I learned from this site. It will help me memorize them if I can repeat them here (and hopefully be of benefit to you if you ever need to remember them). The majority of these are just for CS5.
- Command + Space + Click and Drag Left or Right = Zoom in or out.
- Control + Option + Command+Click = Pick a color.
- Hold down H + Click = Zoom out to see the bigger picture, and when you let go it zooms in on the area over which you released the mouse.