The concepts I found most interesting - apart form "Surplus Value" - were his early conclusions in relation to "alienation" and the "Abolition of Labour" and the "Abolition of Property".

But his theoretical solutions were IMHO never based upon correct assumptions in relation to Reality, and via the wonders of Dialectics, he flew, like the Oozlum Bird, in ever decreasing circles until he disappeared where the Sun does not shine.

"The future is already here -- it's just not very evenly distributed" William Gibson