Track your hypermiling skills on Fuelly. You already know that speeding less will improve your gas mileage, and you know that keeping records helps you reach your goals. Now, eco and cost-conscious drivers track, share, and compare their day to day gas mileages. Of course, driving less will help you save even more money -- and CO2 emissions.

Sign up now for the October 2008 Eat Local Challenge. The traditional Eat Local Challenge -- "commit to eating only locally grown foods for a period of thirty days” -- sounds rather arduous, but really, you can set your own rules to include vital necessities, such as coffee! I've tried the 100-Mile Diet in the past with relative success. After all, the first rule's start small. The second rule: There are no rules.

Reinvent eco-construction via Re:Construct. "You are what you build," according to this competition, which wants to see "your inventive ways to create new types of structures and techniques -- or renovate old ones." Think you can rethink construction? Then register and submit your entry by September 15 for a chance to win $2,000 and internet fame.