Blackle - power saving google

I do't how the name arrived (may be black and google). But yet its the one really saves the power while using the site for search. 

You can get more information at

http://www.blackle.com/about/

The cost saving calculation is available here

http://ecoiron.blogspot.com/2007/01/black-google-would-save-3000-megawatts.html

-srinivas.