Earth Hour is tomorrow. What started as an Australian initiative in 2007 has now gone global, and is gathering a lot of support as a symbolic action. In short, it's about turning off all your lights for 60 minutes at 8:30 PM in your local timezone. Check it out to see how much energy consumption such collective efforts actually shave off. It might surprise you.
Here in Norway, the action is endorsed by the government and organised by WWF. Pentax is one of the sponsors, and lo and behold! There's even a sponsored photo competition with prices by Pentax. Nice touch. :-)
Personally, I'd like to encourage all Pentaxians to make the most out of this occasion. Try shooting the night sky. Try out long exposures. Be part of it!