Can iTunes be made to playback video fullscreen on a second monitor on
a Mac? I don't care if it's a computer monitor or a TV.
Apple gives the SimpleVideoOut example
[http://developer.apple.com/samplecode/SimpleVideoOut/index.html].
Is there a way to make iTunes playback video in this way?

The quick and easiest way to achieve this is purchase another video
card for your mac.

Such as this one: http://store.apple.com/1-800-MY-APPLE/WebObjects/AppleStore.woa/6274003/wo/Ux5HRmSWaoIM3SpT1CS0vBqc8ow/1.0.19.1.0.8.25.7.11.0.3

This will let you run another monitor or tv, essentially doubling the
desktop you space you have available. You can then display iTunes on
the separate monitor and enjoy your iTunes videos in full screen.