Both the Drupal Editors handbook and the Drupal Administrators / Developers handbook have been merged into the Resources for Webmasters website and can be accessed there. If you should find a page missing that you believe should have been copied over, please email webmasters@gatech.edu and let us know.
If you want to jump straight to the Drupal content, it has been organized on a Drupal shelf, split out into three books: