Earth Hour
In case I am not the last person on Earth to know about this:
On Saturday, March 29, 2008, Earth Hour invites people around the world to turn off their lights for one hour – from 8:00pm to 9:00pm in their local time zone.
If this site is working correctly, you can find more info here: http://www.earthhour.org/
Otherwise between 8p-9p today sit in the dark Do nothing , how lazy can you get to help the environment.