Bring Back ‘Save As’ Option
Mountain Lion changed what Command+Shift+S does. It has now been mapped to the new Duplicate function and each time you hit the shortcut, a new copy of your current file is created. The Save As option is still there but you will have to access it from the File menu. To restore the Save As functionality, you will have to visit Keyboard in System Preferences. In the Shortcuts tab, select Application Shortcuts in the panel on the left, add a new shortcut and name it ‘Save As…’ record Command+Shift+S as the shortcut for it and save. You now have your Save As functionality back with its old shortcut.