This plugin uses WordPress to transform your content into a book.
Anthologize is a free, open-source, WordPress-based platform for publishing. Grab posts from your WordPress blog, pull in feeds from external sites, or create new content directly in Anthologize. Then outline, order, and edit your work, crafting it into a coherent volume for export in several formats, including PDF, EPUB, and TEI.
Interesting article “Academics Build Blog-to-eBook Publishing Tool in One Week” at: http://www.theatlantic.com/science/archive/2010/08/academics-build-blog-to-ebook-publishing-tool-in-one-week/60852/
Plugin homepage: http://anthologize.org