r3think Rethinking Sustainability, Marketing, Lifestyle, and Other Stuff

I’ve been using stickK for a week now (via Freakonomics), and I think it’s pretty interesting. So what does it do? Here is a short excerpt from their FAQ section:
stickK helps you achieve your personal goals through “Commitment Contracts.”
After signing up with stickK, you will be able to create a contract obliging you to achieve [...]