One thing I would advise, because this is a competition after all, is not to show your design or progress to anyone but a very few trusted friends until after they have confirmed receipt of your quilt in CO. Fellow quilters will understand, I guarantee it. A good support system is priceless, but keep the design itself close to the vest.
DA Mayer entered the 2008 Challenge, but that's the only other board member I'm aware of that has sent something in.