Removing /opencms/opencms from site url
From OpenCms Wiki
Install opencms as ROOT with a very simple configuration of Apache and mod_jk (still works with OpenCms 7.05, Apache 2.2.9 and Tomcat 6).
Also, a guide ships with Opencms.
See this post http://opencms-forum.de/opencms-forum/viewthread?thread=1990
Other post listing various methods of removal (including URL rewrite with Tomcat only) by Arash Kaffamanesh can be found here
