If you're an extreme sledding fan, you will love this competition:

Radius Product development is putting together a (first annual) Green Sled Competition where designers, design offices and teams around Boston will make sleds out of recycled/found materials. On March 7th we will meet at Tenney Mountain (NH) to test out the designs and compete on numerous levels.

Rules and guidelines: The sled must be made of at least 90% recycled, reclaimed, or 2nd-hand objects and materials. The other 10% is open to allow for hardware (nuts, bolts, paint, etc). The sled should be made of at least two different materials. The sled must carry two people down the hill. There is no limit to the number of members on a team. A team can be made up of members from more than one firm or company. Gravity-powered solutions only...