Good article that explains the pros and cons of open content. Overall, I see this as a positive movement in education. Two possible negatives from my perspective are:
Lack of systematic way to provide peer-review of content – We’re counting on a wikipedia model rather than having a publisher pay experts to review new content.
Possible digital divide issues – As more open content becomes available online there may be an expectation that Internet access is widely available to all. While this is a concern, there are teacher and students who will benefit from this content who do not have access or can’t afford the paper-based content. We must continue to work towards providing access for all while not holding back those who already have access.