Mac OS X Tip: Create a Keyboard Shortcut for Any Menu Action in Any Program:
"Open the Keyboard & Mouse preference pane in your System Preferences and click on the Keyboard Shortcuts tab. Click the little plus (+) sign, choose the application you want to assign a shortcut for from the drop-down, then enter the exact name of the menu bar item you want to execute (for example, I want a shortcut to resize an image in Preview, so I'm using 'Adjust Size...'). Then just pick your keyboard shortcut, click Add, and voilĂ —you've successfully added a new shortcut to your Mac. When you open the app, you'll notice that shortcut is even visible next to the item so it'll be easy to remember."
Great tip!