The whole of the most recent Real World Economics Review (formerly known as the Post-Autistic Economics Review) is devoted to the question of “How should the collapse of the world financial system affect economics?”.
My paper, which led volume 49, is reproduced below. If you’d like to read the entire volume, click here for the online version and here for the PDF. You can also go here for back issues, and to subscribe for free.
The most important thing that global financial crisis has done for economic theory is to show that neoclassical economics is not merely wrong, but dangerous.