I had missed posting about this while I was working on redoing the site.
Dammit. He was one of the greats. His "blowback" series was incredibly insightful and blistering at the same time, and his work on Japan helped define how people thought of that country's economy and political structure. He was also, by all accounts, a genuinely decent human being.
He received a moving eulogy on TomDispatch that I'd encourage you to read, and another by Steve Clemens at the Washington Note, which also highlights his unbelievably important work fighting against the movement by "rational choice" political scientists to import all of neoliberal economics' various pathologies.
(Thanks to Avedon for the links.)