Annoying, the author doesn't seem to answer his own (@#*&$ question with anything substantial. I'm hoping by posting here that something other than the Atwood Developer BoR can be cited as something valuable...one study is hardly enough to convince most managers. :(
Actually, having switched to a 27 inch imac (2560x1440), I find that one monitor is actually better than two smaller monitors. I was hoping the article would come to that type of conclusion. Alas ...