There's so much documentation that I'm not sure where the best place to point you is. In additional to personal sites like Jade's, there are a ton of useful community-contributed documents in
http://sdm.openacs.org/new-file-storage/ - I'm not sure if they have been brought over to the new OpenACS site somewhere? Also:
General OpenACS articles
https://openacs.org/features/
Excellent books on TCL, SQL, general web app development, ...
https://openacs.org/faq/one-faq?faq_id=43840
The problem sets might help
https://openacs.org/education/psets/
If you are comfortable with all of the above already, and the package documentation isn't helping you, try your api-doc installation or https://openacs.org/api-doc/ as many procs are well documented at the source level.
Some WimpyPoint presentations are useful:
http://sdm.openacs.org/wp/index.tcl?&show_age=
These forums are of course one of the best sources for information. If you have AOLserver questions, there is also an AOLserver mailing list, WIKI, weekly chat on AIM, etc. OpenACS'ers are often available on IRC.
