Guys, UAC is a convenience feature. It improves the user experience when you are logged on as a LIMITED USER by enabling you to automatically "run-as Admin" by prompting for Administrator credentials when a program requires it. If you're already running as Administrator, it might as well be non-existent or completely turned off.
Then why isn't it turned off for administrators? That's the whole point: UAC is now so easily circumvented for administrator accounts that it might as well be set at its lowest level. So why doesn't MS do that? The current level serves no purpose.