That's why I posted here too. A policy market is closer, though there's an old system called crit.org that was designed to mimic the Ted Nelson model of layers of typed comments.
I just don't know what's out there now.
I'm going to post this request at a number of econ blogs I read, in case others have suggestions.
I'm feeling, rather desperately, that we need a faster tool for critiquing and comparing the different proposals out there. I want a mechanism by which the experts can point out flaws in different solutions and arrive at an optimal selection (if not consensus). If this all has to happen in a week, the blogosphere needs to be even faster than usual.
Is there a site out there doing that now?
Could wikipedia support this, or would the comment threading collapse under the weight?