Marx's capital (Volume 1) was published September 14, 1867, exactly 150 years ago. Below a few links to posts on Marx written over the years.

What makes capitalism capitalism? (on the definitions of capitalism as a mode of production)

Sraffa and Marxism or the Labor Theory of Value, what is it good for? (on the labor theory of value)
Was Marx right? Nice of you to ask, but... (on common misconceptions about Marx)

A Note on the Concept of Vulgar Economics (an important idea, often neglected)


Garegnani on Sraffa, Ricardo and Marx (on the relation of Marx with classical economics)


The last Marxist? Or shortchanging Hobsbawm (a critique of The Economist's obituary)
And this one on why Marx and Keynes are essential for a coherent heterodox alternative to the mainstream:
The meaning of heterodox economics, and why it matters