How do you turn off a single display when running two by software?

so, i just bought a vizio 47" 1080p lcd tv and am very impressed with how good it looks connected to my imac with a dvi to hdmi cable. the problem is that sometimes i want to turn off the imac's screen because it can get distracting. any ideas?? thanks in advance.
Ray

This still is a serious issue. Has anyone heard any official statements from Apple regarding this? The iMac would be a great HTPC/computer combo, if it was possible to turn off the internal LCD.
With the current state of Mac display management, this is a real show stopper for PC-based friends looking for alternatives for PC/Vista.
iMac 24"   Mac OS X (10.4.9)  

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