Quickly Access System Preferences Using Option & Function Keys
If you want to quickly access the Mac OS X System Preferences, you can do so by holding down the Option key and then hitting various function keys. Option+Brightness pulls up the Display preference pane, Option+Expose brings up the Expose preferences, Option+Volume controls bring up the Sound preferences, and so on.
This should work on any MacBook or MacBook Pro, and probably any other Mac hooked up to a newer Apple keyboard. I tried this on an much older iMac keyboard and the results were a no-go, so I assume you’ll need a keyboard with the defined system functions on the F keys.