Downloadable version of this paper presented at the OECD conference on open educational resources this week in Barcelona (I wish I was still involved - and it would have been handy! - but NRC and OECD could not agree on a contract, so I'm out). Anyhow, "One of the most often cited barriers to the development of Open Content and Open Educational Resources is that of persuading users, in the form of teachers and trainers to share. We are unconvinced that this is a real obstacle if we can develop a community to support such social processes. It is this community which is the real promise of OER and Open Content." See also Open Content Rules and OERs and Quality.