I tested rc3 on Mac OS X. Java 1.4.2_05 The usual things worked well and i also did the DocBook/XSL test and the "Download DTD" example. I have not yet tried the forrestbot.
However i had some trouble with deploying a webapp under a full Jetty. The default seed site my-project.war was okay, but the war from site-author was broken with a Cocoon error ... request-uri: /forrest/index.html cause: /private/tmp/Jetty__36366__forrest/webapp/project/skinconf.xml (No such file or directory) I wonder if some configuration is not being handled, because our skinconf.xml is at a non-standard location. Another issue: The core DTDs are fine, but additional DTDs are not being handled via a webapp, e.g. the "Download DTD" example or DTDs from plugins. -David