I don't know if any one else has stumbled up on earndit.com but it is AWESOME. It is a site that gives you stuff for being active. You can synch your fitbit to it (or run keeper, foursquare, etc.) and when you are active you get points. Once you have enough points you can cash them in for gift cards to the sponsor sites or as charitable donations. I have increased my workouts so I can help provide a goat to a family in need. The sponsors also run competitions you can sign up for and they give out their own prizes for the winners of those competitions.

So, if you have some time you should go check it out. http://earndit.com/