That is the new venture from Dubner and Levitt and John List, and the web site is here. Dubner describes it to me as “…a crowd-sourced research project that tries to learn something about decision-making.” The FAQ is here and it states:
Sometimes in life you face one of these decisions, and you just don’t know what to do. In the end, whatever you decide will essentially be a flip of a coin. Freakonomics Experiments helps you make the decision by flipping that coin for you. Over the next few months, we’ll then check in with you with surveys and other materials. In turn, you’ll help further scientific research. Unlike most games of chance, participating in this experiment is win-win.
I look forward to seeing what they come up with.