Blackle.com - Saving energy one search at a time

At IBM, we got sent this link about Blackle and I recommend checking it out just to see what it is about but I will give you the heads up anyway.

Blackle is a Google search engine with a black background instead of the normal white one, which saves power as the screen doesn't use as much power to display the page. It has a stat on the front page saying how many watt hours have been saved. Now I am not sure if it really does save power because it still has to display black but it may true in that black is the most energy efficient colour.

What are your thoughts and are you going to start using Blackle over Google?