For my wife and I, we had pretty good results with these:
http://www.campmor.com/o2-cool-carab...ting-fan.shtml
Hang the carabiner on the ridgeline, and the weight of the fan happens to point it at exactly the right angle to blow on your face in an assymetrical lay. It runs on one AA battery....not sure how long before it runs out, though....I usually fell asleep while it was running, and it was dead sometime before I woke up. One of these days, I need to test it with some rechargeables, since I think some of those are supposed to run longer.
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