Preference iCons in Dock?

You can put System Preferences in the Dock, but not individual preferences.

 

Actually, the previous poster is incorrect, it can be done - but only to the right hand side of the dock (by the trash icon).

Open finder and navigate to /System/Library/PreferencePanes/

You can then drag whatever prefpane you wish into the right side of the dock - when clicked it will open system prefs at that prefpane.

 

Neat trick! Thanks! I was trying to drag from the System Preferences, which doesn't work.