I finally got around to uploading the page and darcs repo for Cl-Component, a "simple CLOS solution for directed acyclic graphs". http://common-lisp.net/project/cl-component/ This is what you'd call a "pre-release". I plan to fully rework the API and implementation as soon as I get a chance, but unfortuanatly the project is somewhat on the back-burner right now. Fortuanatly this release features full documentation and unit-tests until then... Comments are welcome, my goal is to make dealing with dags of CLOS instances trivial, and make a useful tool for rolling object systems, system definition utilities, and scheduling utilities. Nick