How many times have you had to close all open applications one by one?
cmdQuit close all the open apps with one click. No longer have to start closing one by one. Quick and easy. Now, Finder windows close too.
With Lion, every time you want to turn off your Mac, you have to deactivate the stick to avoid having to start with all apps opened. Now, if you run cmdQuit before shutting down the Mac, when you switch everything will be clean.