The Library of Human Imagination; 1Mb download = 1 lump coal
I saw this ~7min presentation and was pretty floored and happy
http://www.ted.com/index.php/talks/jay_walker_s_library_of_human_imagination.html
The Library of Human Imagination - WOOT! Makes me want to roll up my sleeves and devour everything in that place!
A very, VERY interesting relation was also presented: for every megabyte you download from the elsewhere in the internet, it takes 1 lump of coal to power that. 200Mb = 200 lumps of coal. 20000000Mb...back up the truck and don't breathe too hard...get the idea?
I dunno how accurate that calculation is, but I think there is plenty enough truth to it...
Best,
Shalin

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