Personally, I'm with the release of Lion appeared annoying feature Duplicate, which finished in the good old Save As main menu, place the application. Of course, Save As... on the really does not disappear, and you can use it, open the app's main menu and hold down the Option key and furious keyboard shortcuts Command + Shift + Option + S. The new OS X Mountain Lion everything remains the same, but fortunately there is a way to replace the original parts.
Actually, the trick is very simple. Head over to the system settings, select "Keyboard" tab "shortcuts" in the right list - select "All Applications" (I apologize in advance - for centuries using English interface and can be inaccurate in the Russian-language titles points). Press the plus and add the combination Shift + Command + S, which will be called «Save As ...» (it is important not to use the three point and speialny dot symbol), and then another - Shift + Command + Option + S named «Duplicate».
Voila! Now the data items in the menu have changed places: the default function is displayed Save As..., and on down the Option - Duplicate:
I am leaving the reader a little homework: check out how it will work in OS X c Russian interface and share with us the results in the comments;)
UPDATE. If you have a Russian-language OS X, the name of the keyboard shortcut in this case it is necessary to write in Russian - Save As and Duplicate. Thanks Roman Palchenkov for the tip!