On Saturday, March 29th at 8pm, millions of people, buildings and landmarks around the world will turn off their lights for one hour – otherwise know as “Earth Hour“. The effort is meant to show that the world can come together to make a difference in the fight against climate change. From the Sears Tower to the Golden Gate Bridge to the Sydney Opera House, familiar landmarks in some way will be going dark to show support. There’s even word that The Weather Channel HQ in Atlanta will be turning off all non-essential lighting on their building as well as promoting Earth Hour on their program Forecast Earth. Who wants to bet former founder John Coleman is going to lose it?

Obviously, we’ve got some great star power behind this event as well. Pete Wentz from Fall Out Boy, actresses Cate Blanchett and Nicole Kidman, Dolly Parton, Blake Lewis, Menudo, Lonestar, and many others. In Canada Nelly Furtado is even giving a free concert. To date, 25 cities around the globe have been designated by World Wildlife Fund as official Earth Hour flagship cities, including Atlanta, Chicago, Phoenix and San Francisco in the United States.

To see how you can participate — though we bet you’ve got that figured out — check out the official Earth Hour site and sign up to pledge your support!

[UPDATE] Looks like Jeremy Piven had lent his voice for a new video for the campaign. Check it out below.

The 1,415-pound ball will be covered in more than 9,500 energy-efficient light-emitting diodes that will illuminate the ball’s over 600 crystals and set the sky a blazin’.  Officials (whatever that means) say that the LEDs are estimated to use the same amount of electricity as about 10 toasters, which is like the craziest, most super cool thing I’ve ever heard.

As always, my precious little city will rock New Years eve celebrity style with musical performances by Hannah Montana, The Jonas Brothers, Kid Rock, Lenny Kravitz, Lifehouse, The Bravery, and alums from Fox TV’s American Idol, Carrie Underwood, Jordin Sparks and Blake Lewis. 

So take that N train downtown and come celebrate the end of 2007 with the lot of us. Did I mention Hannah Montana will be there?