I’ve responded to a blog post and a few private e-mails recently on this topic. Two companies seem to have solutions – OrgPlus from Human Concepts and ILOG Elixir. I don’t have any experience with Human Concepts, but I did work extensively with ILOG in my SGI days. I have high confidence in anything they develop.
CMOrgChart was an entry in the Flex Derby, but not sure if the source is available.