Seen the original response and this reply and wanted to point something out. From the terminal, run this:
defaults write -g ApplePersistence -bool false
If you open Preview or TextEdit or any other programs, you will notice that "Save As" is back, and autosave also stopped for these apps.
Also, as far as automatic termination, you can disable that too:
defaults write -g NSDisableAutomaticTermination -bool true
A few more commands I found useful:
defaults write -g NSQuitAlwaysKeepsWindows -bool false
defaults write -g NSScrollViewRubberbanding -int 0
The first one stops reopening all your windows when shutting down and reopening apps, and the other mostly disables the stupid bounce scrolling when you go too far... it seems to work with pretty much everything but Safari and Chrome. These all helped make Lion bearable for me, and they also all work in Mountain Lion.