Blackle.com is a search site powered by google's search engine, the only difference being that Google's background color is white while Blackle's is black. This site was made black to save energy and their motto is "Saving energy one search at a time". But according to Google's Official blog, they say that Black does not help save energy.
According to Blackle, the site helps saves energy because the screen is predominantly black. "Image displayed is primarily a function of the user's color settings and desktop graphics, as well as the color and size of open application windows; a given monitor requires more power to display a white (or light) screen than a black (or dark) screen."
The site claims that its black color has helped saved about 766 KiloWatt hours of energy so far. But this post at Google blog says "our own analysis as well as that of others shows that making the Google homepage black will not reduce energy consumption. To the contrary, on flat-panel monitors (already estimated to be 75% of the market) displaying black may actually increase energy usage."
Well Blackle was nice to come up with a way to try and save energy. The best that we can do with monitors is to turn them off when we don't use and avoid using screensavers for too long.
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