Free book summaries: wikisummaries.org

WikiSummaries.org offers free summaries of the latest books. There are only ~ 40 books at the moment, but I'm sure the list will grow in the future. David Allen's Get Things Done: The Art of Stress-Free Productivity has been summarized rather well.

Btw, if you want to read (or listen to audio books), head over to the Project Gutenberg website. They have over 17,000 books that are out of copyright.