Blackle is the first website designed keeping a green ideology in mind. Based on the Google model (and even using the Google search engine) but with slightly less functionality (no image search, maps, etc.) Blackle is a search engine with a black background instead of a white one.

The concept is that folks who are using CRT monitors (standard tube based monitors) need to power each pixel on their screen that shows a color, including white. On the other hand, black is not a color that is powered, on monitors at least, black is the absence of color. Keeping this theory in mind Blackle uses an all black back ground with gray lettering (which is easier to read against black then white is, instead of there being massive amounts of white space (like on Google) that needs to be powered there is a lot of black space which allows the pixels to ‘rest,’ and the monitor to use less power. Theoretically this will also prolong the life of the monitors.

If you are using an LCD screen however, which is pretty standard these days, well, then it makes no difference, there are no individually powered pixels and the whole screen is powered at once. But, you know what they say: Every little bit helps.