I say look into something that will run in a Kiosk mode. Mac OS X does this nicely but then you need Apple hardware. Windows also has a Kiosk mode and I have seen a few Linux Distros especially for that. Given the fact that so many "general public" sites use flash I would really consider OS X and Windows first.
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"The basic tool for the manipulation of reality is the manipulation of words. If you can control the meaning of words, you can control the people who must use the words." -Philip K. Dick
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