If you want to really save time when using Photoshop, there are a few things you can do. You can arrange your desktop in an efficient manner, you can learn how to make and use presets, use actions, and even batch process. But one way to save time is to use less mouse and more quick key strokes.
Trevor Morris Photographics has generously made short cut key printable documents for Photoshop 5, 6, 7, CS, CS2, CS3 and CS4. You cannot beat it! And the best part – they are free!
To get down the correct printable, go here, and select your version.