Malte: you and I started work on a table of contents for a book on OpenACS. Feel free to copy that to the Wiki:
http://www.rubick.com/openacs/book/
Also, any of the articles that I wrote here:
http://www.rubick.com/openacs
can be copied to the Wiki. If someone took the time to copy the chapters from the OpenACS book link above, and then added in some of the content from those OpenACS articles, that would be a decent skeleton for at least part of the book, and some of the content as well.