Resin 4.0.18 is now available at http://caucho.com/download. Release notes are at http://caucho.com/resin-4.0/changes/resin-4.0.18.xtp.
Resin 4.0.18 is primarily a quality and bug-fix release. For the next several months we’ll be focusing on quality and bug fixes with limited new features. So now is a good time to test it out and to report any bugs at http://bugs.caucho.com.