Feb 4 2012: This idea sounds like an adaptation of the Playpumps already being used in villages. (See link for a photo: http://www.worldchanging.com/archives/000446.html). Why couldn't the same design be connected to an dynamo instead of a water pump? I believe it is already being applied in gyms as well. I'd LOVE to convert my school's whole playground into these sorts of gadgets. Even if they didn't generate an enormous amount of energy, it would still be wonderful.
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A comment on Conversation: Can playground equipment be rigged up to generators/ dynamos to harvest energy that a school could then use?