I'm actually running them side by side right now, but its not proper integration... SO I too would like to know what is required to manually do the integration.
The 220.127.116.11 branch of the integrated tomcat mbean only needs a few mods to align with 3.0 (less SSL support), but there are some code branches of jboss that need to be merged into 3.0 to glue it all together. There are problems with optimized calls. see http://www.jboss.org/modules/bb/index.html?module=bb&op=viewtopic&t=forums/