I think a great book in the modern intellectual history of economics and political economy could focus on Kenneth Boulding, Albert Hirschman and Tibor Scitovsky. F. A. Hayek and James Buchanan could be used to frame the discussion, but the intellectual biographic case studies of Boulding, Hirschman and Scitovsky would put a fine point on the fate of political economy conceived of as a branch of moral philosophy during the post WWII era.
I studied with Boulding at GMU in late 1980s, and I corresponded with Hirschman and visited him at the Institute for Advanced Study in Princeton in the early 1990s, though I never met Scitovsky.
The Social Science Research Council has now established the Albert O. Hirschman Award for Interdisciplinary work in the Social Sciences. The winner for 2007 is Dani Rodrik. Rodrik is a very worthy winner of this award --- a very creative and provocative thinker. And now a blogger as well.
Thanks to Tyler for the pointer.