As I write this, Earth Hour is some 16 days, 1 hour, 36 minutes and 9 seconds away and as of right now you can now download the Earth Hour app for BlackBerry Smartphones straight from App World. Here's the official description:
Earth Hour is Saturday, March 27 at 8:30 p.m. local time and encourages people to turn off their lights to show support for action on climate change.
As lights go off around the world, this application will keep you connected with news, local events and participants from across the globe. Join the movement and stay in the conversation as WWF teams and individual supporters get ready for the big day.
During Earth Hour you can countdown with us, see photos of cities across the globe celebrating and submit your own photos of how you are spending the big night.
For more information on Earth Hour, you can check out earthhour.org. To download the app (built by Xtreme Labs), visit the link below.