Turning one screen off

I just purchased a 30" Cinema display for my Macbook Pro. It hooked up eaisly enough and works like a charm.
At first I noticed that the the new display was acting not as the entire screen, but an extension of my laptop screen so that I could move the mouse from one end of my notebook's screen to the other and then come up on the Cinema display. I was looking for a way to disable the notebooks screen when the Cinema display is connected (at least until my bluetooth keyboard arrives at which point I will be able to just shut the MBP). The only thing I could find was something called "mirror displays" which effectively fixed the screen extension problem. Both screens, however, are still on. How do I disable one or the other? When I'm using the computer I want the Cinema display on. When I go to bed I don't want to keep it on because I want to minimize usage wear. Thanks in advance guys.

Just got the 20 inch ACD for my pretty new Macbook, and found out how to turn off the Macbook display and use only the ACD. See:
http://discussions.apple.com/thread.jspa?messageID=6474608&#6474608
I am very grateful to the author of that thread!
(To turn off the ACD, I suppose one could just unplug its cables from the Macbook Pro if there is no more elegant way to do it. Haven't found the more elegant way yet.)
BH

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