We at my parents restaurant (the Swiss Cottage Restaurant) are going to be doing it!! Its going to be a challenge as we are pretty much already booked out tonight and everyone will be eating by candle light! I recon it will be fun! Will let you know how it goes!! (ofcourse, we will have to have the kitchen lights on for the cooking as it would be too much of a hazard otherwise. But were trying to do our bit)
If you'd like more info about it go to : http://earthhour.smh.com.au/