From the “Wired Science Blog”;

“Many scientists and researchers have pushed for open access policies, but publishers have been reluctant to give up control of the informational resources they have. Big companies like Wiley John & Sons, The McGraw Hill Company’s Nature Publishing Group, and Reed Elsevier argue that they provide valuable and expensive peer-review, and that there’s no way to ensure quality without the subscription fees that they charge libraries and universities.”

More at,  blog.wired.com/wiredscience/2009/03/openmit.html