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Remember the guy who was selling pixel-sized ad space on his page (a total of one million pixels) to raise money for college? Well, first, he has already pimped out quite a few pixels, and second, now you too can join the pixel ad racket. Someone has put together a piece of code that turns your site's unused advertising inventory into a farm of happy money-earning dots.
And here's a rip-off of the original concept.
Update (Sept.25, 2005): It seems the enterprising guy has already made £56,000 in the four weeks since launch.