Permanent Crisis Blog
I stumbled across the Permanent Crisis blog via Continental Drift (which is written by a performance artist) and found it most interesting. It assumes a good bit of foundational knowledge of Marxism, so if you don't have that, you may not get as much out of reading the entries as you would if you did, but they are still worth reading. Two posts, in particular, are required reading, in my book. What is an institutional Crisis of Capitalism? and Keynesian Fordism: global political economy of a passive revolution.