Putting 1 of 2 displays to sleep?

I just started using my 46" HD TV as a second display for playing iTunes movies, etc. I'm using a DVI to HDMI cable and I have 2 questions:
1. When running in dual screen mode, is there a way to stop video output to the TV besides unplugging the cable? The video output is constant when I'm cycling through the TV inputs, isn't this wasting energy? I only want to use it every once in a while.
2. When running in dual screen mode, is there a way to put the primary display to sleep or must it stay on while I'm running the second display?

This feature must have been included with an update because I can now turn off 1 display without it affecting the second display.

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