I've cleaned my screen with a clean, damp, soft rag. My anti-glare screen cover from B&N came with a nice cloth to use. If you don't have a screen protector, you want to be extra careful that any rag you use doesn't have any dirt - that could cause scratches.
I think you've already hit on the batter savers that I'm aware of: wifi off and brightness as low as is comfortable.
I never bother with powering down the NC completely. I suppose if I was on a trip, and needed to eke out every ounce of power, then I might do this, but otherwise w/ wifi off (and even with the setting of "on", the stock 2.1 android turns off when in standby) the power drain of standby mode is quite low.
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