Review: The Official Ubuntu Book, 4th Edition
The Official Ubuntu Book has done well since it was first published. There have been some author changes between the 3rd and 4th editions. Jonathan Jesse and Jono Bacon have apparently dropped off the radar, while Matthew Helmke has joined the team.
On the inside cover page, the book states it was written "with" Ivan Krstic, Jonathan Jesse, Richard A. Johnson, and Jono Bacon, which probably means some of the material they contributed to prior editions is in the current one, but they didn't actively write for the 4th edition (yes, crediting authors in downstream editions can get complicated).
I almost wonder why the Foreword to the 1st edition was included, except that it was written by Mark Shuttleworth. The Preface promises that the book has matured as Ubuntu has, so maybe some of my past concerns have been addressed. Keep in mind that at some point, if a book publishes sufficient number of subsequent editions, it begins to look like a patchwork quilt.