The ACS Core team has posted some design materials for the upcoming ACS 4 release at http://www.arsdigita.com/doc/acs40. We are committed to building a high-caliber system and would appreciate any comments and criticisms on these documents. To contribute a review, please post to the ACS Development Bboard, ACS 4.0 category. We have disabled static page comments on these pages. Please use this forum to contribute any comments as it automatically notifies the ACS Core team and allows for more interactive discussion.