Well, this year has produced some amazing results! I thought last year was impressive, but this year the number of searches smashed 2007, with almost 8 times more searches in 2008.
Earth Hour 2008
Google Search Trends for Earth Hour in 2008

Earth Hour- the wrap-up « Chemistry for a sustainable world
A summary and re-cap of Earth Hour 2008, with links to many relevant sites and news articles. There is additional information on significant solar energy implementation by Spain and Germany (which were not major participants in Earth Hour 08). A final commentary is offered on cynics.
Top Five Things to Do During Earth Hour
Stuck for ideas on how to spend an hour in the dark? Lower Footprint reports five things to do when you turn your power off tonight at 8:00pm and also five things not to do. One of them includes a Death Ray Weapon.

Do a Star Count for Earth Hour
In what is perhaps the most widely-anticipated Earth Hour event, people across the world are getting ready to tune out of the grid and tune into their environment. One way to spend the self-imposed blackout is to simply look up; overcrowded city streets and light pollution often mean we miss (and frequently forget) how truly brilliant our night sky can be.

Google turns its lights out - a gesture to raise awareness for Energy Conservation
The Google home page is "blacked out" as they have "turned out the lights" as symbol to raise awareness for Earth Hour 2008. It's quite striking to see the normally white background on the Google home page suddenly go black. While its not saving any energy doing this, it certainly is going to raise a lot of awareness to everyone that goes to Google to do a search.
Earth Hour Tomorrow Night
Tomorrow night at 8:00h turn off your lights for one hour. Get as many people as you can to do the same. Earth Hour was created by WWF in Sydney, Australia in 2007, and in one year has grown from an event in one city to a global movement.

Nearly nothing but novels Earth Hour, March 29, 8-9
A fiction review site takes a moment to draw attention to the environment and Earth Hour 2008.

THE HOUR IS NEAR! Earth Hour 2008, March 29, 8-9 pm local time
A brief summary of the latest newsletter from EarthHourUS.org. Sign up from any country and participate in the March 29 action where entire cities and many individuals will turn the lights off from 8-9 pm, local time.

Jesus Unplugged: Religious Groups Participate in Earth Hour 2008
Candlelit services are nothing new for religious organizations. So when businesses, governments, and individuals turn off their lights Saturday at 8 p.m. local time, churches, synagogues, and mosques will be holding special gatherings.
The Earth Hour
The Earth Hour - March 29, 2008.

Earth Hour 2008 description plus World Wildlife Fund links
A description of Earth Hour 2008 and both comments and links to the sponsoring organization, the World Wildlife Fund