Please sign the pledge to turn off your lights for an hour next Saturday at 8pm (your local time), and pass the word along to your green friends.
This does not seem to have been as well publicized as it could have been, so if you have more popular blog than mine (could there be such a thing??), please put up a link for http://earthhour.org/
update at 5:15pm est: Maybe the lack of publicity is a New York-area problem. I see that other North American cities are participating, and that the Toronto Star has an entire Earth Hour section online: http://www.thestar.com/earthhour