This is documented.
For tomcat 3.x put the jar into the war.....
copy your EJB jar file to WEB_INF/lib before
creating your JSP war.
If creating wars each time you make a change is a pain, you could do the following...
Package all your beans Home and remote interfaces into one jar file, then copy this to tomcat\lib. In ver 3.2.3 of Tomcat, all the jars in lib are automatically added to the classpath setting on startup. Then, whenever a bean is looked up, its interfaces will be available.
Dont forget to add the jboss\client.jars to tomcat\lib and also put jndi.properties there or somewhere on your classpath.
Hope this helps