Click for the full screenshot
It almost threw me off because I was actually having a hard time getting compiz right down to the pixel and I knew that an inverted display (affecting just my browser) means another compiz trouble to look into.
I didn't notice at first that it's actually an awareness campaign promoting Lights Out SF, a San Francisco CA - wide, conservation event encouraging people to turn their lights off for an hour (among other things). Honestly, what really caught my eye is the black Google home page, but hey, if like what it did to me, it makes billions people aware of environmental events like Lights Out SF, then it's a good effort. :)
The black google really looks neat, and I'm sure the people behind Blackle will be very happy. ;)