I have created an improved version of Hagindaz's Wiki2LaTeX (http://en.wikibooks.org/wiki/User:Hagindaz/Wiki2LaTeX) tool, which helps creating PDF versions of books. It can download the whole book with images and automatically generate LaTeX source code, which can be directly translated into a PDF file. Still, some knowledge of LaTeX is required, but the tool can greatly reduce time of preparing PDF version of a textbook.
Currently it supports output in two languages (Polish and English), but adding support for new ones is quite easy.
The description of the program can be found at http://en.wikibooks.org/wiki/User:Derbeth/javaLatex. Example output is here: http://pl.wikibooks.org/wiki/Grafika:C.pdf.