Lars and Don,
You can see some of the api here.
http://66.250.57.130:9080/api-doc/package-view?version_id=2635
http://66.250.57.130:9080/api-doc/package-view?version_id=2606
Take note that its in pre-alpha state, and I will revise these based from my first experience while using it. OpenACS isn't my day job anymore, although I do have more control of my time now. I hope I can get help especially advices. Unfortunately I still haven't finished the high level design doc. :(