For Keynote, control-click on the Keynote application (in the iWork '06 folder) and choose Show Package Contents. When the new window opens, navigate into Contents -> Frameworks -> SFWordProcessing.framework -> Versions -> A -> Resources -> English.lproj, and then open the file named AutoCorrect.plist.
For Pages, do the same Show Package Contents bit, then navigate to Contents -> Frameworks -> SFWordProcessing.framework -> Versions -> A -> Resources -> English.lproj, and again open AutoCorrect.plist.