Ninja.com is a Google Co-Op frontend to the regular Google Search, but with a black background (and white/yelow text). This Digg err.. link(?) claims it’ll save energy, or be more energy efficient.

I think the only actual value comes from this comment:

“I like it, but needs an “I’m feeling sneaky” button.” - blablaman

And, if you were wondering - on current production monitors (LCD and CRT) a black background isn’t any more energy efficient than a white background.

On LCD it’d actually use fractionally more power (the light comes from a backlight source - the Liquid Crystals have an electric charge applied to filter out a certain bandwidth of light at a certain percentage. (Think miniature bits of celophane)

On CRTs the Electron beam which would normally be aimed into the phosphor, is instead blocked (I forget where - but it’s still generated).

Next-Gen screens may save money - but either way, it’s so small it’s unnoticable. Instead, go get a low-powered laptop. The latest generation processors have very good speed stepping which uses significantly less power when there’s low processor utilisation.