Umm, sorry to break it to you, but on LCD displays the color of the page has nothing to do with the energy used. The liquid crystal part is a filter the colors the light that passes through it. The backlight is usually a flourescent that doesn't vary in brightness in response to what's dispalyed.
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So yes, use Blackle if you have a CRT monitor. If you have an LCD you're just using it for the esthetics though...