I am new to both Snow Leopard and Alfresco - I need help getting Alfresco running under the Tomcat that is included in Snow Leopard. What I want to have is it running on http://www.mydomain.com/alfresco utilizing the Apache/Tomcat that is built into Snow Leopard. I am able to get Alfresco running using the pre-configured Tomcat that comes with the install but I want to have everything running under the Apache/Tomcat that is part of Snow Leopard.
I'm not familiar with Snow Leopard Server (which is what I assume you have, as you mention Tomcat is included). However, it should generally be similar to Snow Leopard with a manually installed Tomcat server. The instructions for installing the war bundle: http://wiki.alfresco.com/wiki/Download_and_install_Alfresco_in_Linux are probably closest.
In order to proxy through Apache (to give you the "clean" URL) you should consult the OS X Server documentation, as I expect there might be an admin tool to do the work for you.