Earth hour is STUPID.
I use solar powered outside lights, leds for inside lighting, I'm switching to 15 seer and above air conditioners, I turn off my pcs after use, I use only low powered flat panel screens, energy efficient pcs (except for my core 2 duo 8800 monster, I gotta have it man :X), energy efficient appliances, X10 home automation for lights to keep power low, irobot vacuum for lower power use, and programmable theomostats.
My sister drives a car with 36 average mpg. My mom drives a car with 26, my brother 25. I drive a 36 mpg car.
Guess what? Earth hour is a pile of crap. Your not fixing a problem, your only having a bunch of people with incandescent lighting turn them off.
Here's an idea. Get more energy efficient stuff. Then the energy problem won't go for an hour, it'll go for good.