Having recently heard and met Etienne Wenger, I have renewed my interest in his work, and found lots that really talks to the kind of work we are doing on affordances. I short, from my perspective, CoP are a powerful mode of creating, supporting, CoP for what he calls 'social learning'. The paper that I find most useful is Learning for a Small Planet, which is actually a project proposal. It is not easy to locate and download, so I got sent copy from one of his colleagues, and in the interests of making it more widely available, I have posted a copy here: