Forum OpenACS Q&A: OpenACS documentation on rubick.com
I'm moving my web server to Google Sites (one less server to maintain) and it's likely that many of the OpenACS articles will not make the move.
If anybody finds any of that information valuable, probably the best place for it is in the OpenACS wiki. Feel free to copy anything under the openacs directory.
If someone with openacs.org access had the time, I think we should try to hang on to these page. I've found them useful over the years.