I remember somebody posting here are about using the F3, F4, and F5 keys as shortcuts for System Preferences, and I think it's been expanded in 10.1.5. I used to get the system beep showing sound levels *and* System Prefs. Now, option plus F3, F4, or F5 takes you directly to the Sound PrefPane (with no System Beep, and on PowerBook keyboards, without the Fn key), and option plus F1 or F2 brings you to the Displays PrefPane.
[Editor's note: These key combos do nothing on my G4/733, so I'm not sure if this is hint is valid or not ... if it works for you, let us know!]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20020610224734509