DIY Eco-Tech contest

My friend Graham and his team at TreeHugger are running a DIY Eco-Tech contest.

You have to come up with the best homemade invention/hack of technology to make it more eco-friendly. Prize is a $230 Voltaic Systems backpack. Plus, a 2 year subscription of Make Magazine and a limited edition MAKE T-shirt.
You have until September 7th, 2005 to submit your entry.