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For an overhead projector, I think you're going to be stuck with at least one fan for the LCD panel. I can't think of any way to transfer the heat away from the LCD other than blowing air across it.
Then there's the lamp inside the projector, which the projector's fan is supposed to keep cool. Again, not sure how you'd cool a lamp like that without moving air across it.
CPUs are much better suited for watercooling since you can actually make physical contact with the hot component and draw the heat away. In both the case of the LCD and the projector lamp, making physical contact with the hot components will render them useless by blocking the light.
With that in mind, I would suggest instead investigating quieter fans instead of liquid cooling. Vantec's "Stealth" series of 120mm fans are incredibly quiet, and would probably work great for cooling the interior of the projector.
With some clever ducting, you might even be able to do something like draw cool air over the LCD and exhaust that air into the projector chassis with one 120mm fan, then use a second 120mm fan on the other side of the projector to exhaust the hot air, thus cooling the entire setup with two sufficiently quiet 120mm fans.
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