I love contests, so when I heard about Challenge.gov I was ecstatic. The idea behind this Website is that U.S. government agencies post challenges and the public provides solutions. Examples of current challenges include creating nutritious school lunch recipes, composing wake-up songs for NASA astronauts, and developing digital forensic investigative tools, techniques, and methodologies. There are also often prizes for solving challenges.
I've had some problems accessing the site, but hopefully they'll get all the bugs worked out soon. From what I've seen I think it'll be worth the wait. Now you'll have to excuse me while I try to help NASA find new ways for astronauts to do their laundry in space.