How do I tell OS X to never include certain folders in Recent Places on Open/Save dialogs? When I tried to save a document I noticed a recent section and folders listed I don't want people to see. 



How I can either get OS X to never add these to Recent Places, or if that's not possible then turn off Recent Places period?
You cannot do it on a per directory basis. What you can do is:


Clear the current list with the following command in Terminal:

defaults delete -g NSNavRecentPlaces

Then repeat it each time you want the list to be cleared.
Disable saving the Recent Places history completely with:

defaults write -g NSNavRecentPlacesLimit -int 0