Everybody!
Devel::Diagram will discover the classes of an arbitrary suite of Perl
modules, and render that as XML and/or HTML.
It produces a hash table that can be converted to XML (or other formats)
via a Render() method. An XSL stylesheet is included that converts that XML
class diagram into HTML. The result is kinda garish, but there it is.
Examples of its output are included in the distribution.
See http://search.cpan.org/author/GLENNWOOD/Devel-Diagram-1.00/
I hope you find it useful!