I know it is possible to write my maven site in markdown, using e.g.
http://code.google.com/p/doxia-module-markdown/wiki/Usage
Is it also possible to create books written in markdown or rest? I couldn't make this work using book-descriptors as described in
http://maven.apache.org/doxia/book/index.html
How do I tell doxia in which markup language my sections are written?
You can generate book from markdown using pandoc
Doxia is a small tool which covers to generate simple html only
But you should be able to generate maven site and books using same markdown.