Anthologize is a free, open-source, WordPress-based platform for publishing.
"Use the power of WordPress to transform online content into an electronic book."
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 single volume for export in several formats, including—in this release—PDF, ePUB, TEI.
Case studies: http://anthologize.org/about/use-cases/
Download Wordpress plugin: http://anthologize.org/download-plugin/
(WordPress 3.0 and PHP 5 required for installation. Please note that at this time Anthologize cannot be installed on blogs hosted at WordPress.com)
Find out more: http://anthologize.org/