CommentPress is an open source theme for the WordPress blogging engine that allows readers to comment paragraph by paragraph in the margins of a text. Annotate, gloss, workshop, debate: with CommentPress you can do all of these things on a finer-grained level, turning a document into a conversation. It can be applied to a fixed document (paper/essay/book etc.) or to a running blog. This site is presented in "document" mode.
CommentPress was developed by the Institute for the Future of the Book. Version 1.4.1 is available here, with compatibility up to WordPress 2.5. Version 2.0 is presently being debugged, with a pre-alpha release available at Google Code. We are planning to release 2.0 by the end of March, 2009.