Using the keyboard in System Preferences!
Even Utilities such as System Preferences have some great hidden features. One of them is the search. If you are always using the keyboard to navigate through your Mac (with apps such as QuickSilver), you'll want a way of using the keyboard to navigate through System Preferences as well. After launching System Preferences, instead of clicking on an icon with your mouse, you can just hit "Command-F". It will instantly bring you to the search box in the upper right corner. You can then start typing the first few letters of where you want to go. It will automatically highlight the possibilities. Once the one you want is highlighted, you can simply hit "Enter"!