Gnuman.com have also reviewed The Official Ubuntu book and find it a great read. Tom Duff has also reviewed it in his blog.
Read it here
The Official Ubuntu Book was well written and covered all topics that is necessary for a new Ubuntu user who is either trying out Ubuntu for the first time or just got fed up of Windows. It was a great read and there were enough pictures to fully understand what the authors were trying to portray.
And then there's
This is not a 1000 page “Ubuntu Exhaustive Reference” manual. Instead, it's focused, practical, and written by the experts. Equipped with this book and the included media, there's no reason you shouldn't be up and running Ubuntu in no time flat…