Readers may remember Amelia Sharman as one of the authors of the "Entrepreneur" paper, about the disreputable shenanigans that led to the EU's biofuels mandate.
Amelia is now in the midst of a PhD looking at global warming sceptics and has just publiished a working paper, describing the results of a social network analysis of sceptic blogs. It can be seen here.
I've only skimmed through it, but it looks reasonable enough. One issue I noticed is that she has based her analysis of BH traffic on the domain bishophill.squarespace.com, which is what I used before I got www.bishop-hill.net, so the figures may not be accurate. But I guess this is why publishing a working paper is a useful approach.