^^^^ CB: Kinda hard to keep track of all the Marxes and Althussers, but I'm just kidding, because I think Althusser's discussion in an essay on Marxism and Humanism is helpful, and that he does locate significant development in Marx's thought even if not the "last word". Clearly, Marx started out as a Hegelian then went through the Feuerbachian break with Hegel to atheism and then went beyond Feuerbach. Marx critiques Hegel in the 1844 manuscripts.
See some discussions here:
http://lists.econ.utah.edu/pipermail/marxism-thaxis/2009-February/023999.html
http://lists.econ.utah.edu/pipermail/marxism-thaxis/2009-February/024005.html http://lists.econ.utah.edu/pipermail/marxism-thaxis/2009-February/024015.html