Does rdoc have the option to includ graphviz diagrams? I saw this
announcement by Dave Thomas from way back...

http://groups.google.com/groups?q=graphviz+dave+thomas+group:comp.lang.ruby&hl=en&lr=&ie=UTF-8&oe=UTF-8&group=comp.lang.ruby&selm=m27kq746a5.fsf%40zip.local.thomases.com&rnum=1