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I believe it's as simple as using a solvent that is safe for screens and a soft cloth, preferably something like a microfiber cloth, to wipe the screen off. The solvent could simply be water, but there are several cleaners marketed for LCD screens. The big thing to avoid is typical window cleaner that has ammonia or vinegar in it. That goes for any screen that isn't plain glass, including CRTs with anti-glare. It could create a haze on plastic screens and has a high chance of removing anti-glare coatings.
I've had good luck with lightly dusting screens periodically with swiffer duster sheets (the dry ones). Occasionally, I'll use the lens cleaner that we have laying around for cleaning eye glasses, though I haven't tried that on LCDs (it's safe for anti-glare coatings and plastic lenses though, so...)
As an IT person, that's what we've done around the office, where 99% of the screens are now LCDs, and i've noticed no ill effects. These mild solvents don't do a great job of getting greasy finger prints out on LCDs with flexible plastic screens though (i.e. PC screens)... they'll usually do it, but it takes several applications to do so, and some rubbing. If you have to apply more pressure than light wiping, I would suggest powering the screen off. Still, don't press too hard. The approx. pressure it takes to press a key down on a keyboard is probably just about right for general tough spots.
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