Today, in case you hadn’t already noticed, Google is black.

Black Google, symbolising Earth Hour 2008
This is to symbolise ‘Earth Hour’, which aims to help make people more aware of the energy they use on a daily basis, by asking them to turn out their lights between 8pm and 9pm (in their time-zone) tonight, Saturday, March 29th.
To find out more about Earth Hour and what you can easily do to help save energy, visit Google’s Earth Hour Page.