Quick Opacity Change
Here’s a keyboard trick for adjusting the opacity of a layer.
Printing In CS3
There’s no need to go into Page Setup because now in CS3, Photoshop includes all of the Page Setup options under the Print command.
Full Screen Mode
If someone passing by your workstation wants to take a look at your document, show it off with a plain background.
Put One Photo Into Another
Use the Paste Into command to place one photo inside another.
Ultra Eye Sharpening
Use the Unsharp Mask command to make the eyes of your subject really sparkle.
Reduce Noise in the Shadows
In some cases, you can use a Selective Color adjustment layer to remove the noise from the darker areas of your image.