Dual displays, one to sleep?

I have a dual monitor configuration with my new Mac Pro cylinder.  One display is Thunderbolt, the other a Cinema Display (mini connector).
I don't always use the second display, and I have it set to it's own space.   But I'm wondering if there is some clever way I can put that space/display to sleep, independently.  If I switch to it, via mouse or via spaces, then it would come back to life.
I'm guessing this is not possible, as I've tried looking around.
Thanks.

SwitchResX
<http://www.madrau.com/srx_howtouseit/srx_howtouseit/srx_switchresx_menus.html>
can disable and enable displays.

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