This page combines the idea of the “borehole” from RealClimate, a collection of rejected comments, and the “shadow threads” idea of John Mashey.
We will not only put rejected comments here, we will sort them by article. This will make the background conversation, if any, easier to follow. Also, if comments are accepted only in part, the unsnipped version will be here.
[UPDATE - This is the first volume of the Borehole, from the site's founding through June 20, 2013. See here for more if you like this sort of thing.]