Hi,
I am also seeking the solution of integration of Tomcat 4.1.24 and JBoss 3.2. But I could answer you the first question.
On
www.jboss.org there is also a jboss_tomcat integrated bundle. If you choose the JBoss alone. It will use a in-build Web Server, which is called Jetty.
Good luck, if you have any idea about how to integrate JBoss and Tomcat manually, pleaz don't forget to let me konw that.