I've contributed to a small number of books. One day I might even get round to writing one.

Content Design, by Sarah Richards (editor)

The Morning News Annual, 2008 (contributor)

The New Writer's Handbook, Volume 2 (contributor)

Your Life in Web Apps (short ebook in DRM-free PDF format) (author)

We’ve got blog (contributor)

Mac OS X Hacks (contributor)

iWork, The Missing Manual (technical reviewer)