Roberto's documentation is a great starting point, but I expereinced a similar disorientation when first confronted by the richness of the OpenACS system. So many modules - so much capability!
Would it be possible to get examples of code and other people's design ideas? Maybe a new forum?
I know I compulsively check any new OpenACS site for good ideas. But, of course, the clever implementation details are buried in the (unseeable) Tcl. This is a good thing, in many cases, but I'd appreciate some way of appreciating the sheer artistry of some of your implmentations.