A couple of years ago John Stewart and I published an extended evaluation and critique of the original concept of autopoiesis from the perspective of enactive cognitive science:
Froese, T. & Stewart, J. (2010). Life after Ashby: Ultrastability and the autopoietic foundations of biological individuality. Cybernetics & Human Knowing, 17(4): 7-50
I recently noticed that Humberto Maturana kindly wrote an extended response to our article in the same journal:
Maturana, H. (2011). Ultrastability … Autopoiesis? Reflective Response to Tom Froese and John Stewart. Cybernetics & Human Knowing, 18(1-2): 143-152
Unfortunately, I don’t have access to the original PDF of the response, but the link above will take you to the publisher’s website.