Hi Kenneth,
we in Quest Computing still use the original acs-workflow package (which was later rewritten as plain "workflow" but we prefer the original- it's incredibly powerful). I know Frank Bergmann in Project Open uses it too (see this posting https://openacs.org/forums/message-view?message_id=329333 and also http://www.project-open.com/en/package-acs-workflow - I know Frank has written a lot of documentation around it).
Hope this helps
Brian
