Ubuntu Pocket Guide and Reference
Ubuntu Pocket Guide and Reference is freely available and issues the current new Ubuntu version 9.04 “Jaunty Jackalope“. It’s worth reading it, but it only serves as an introduction to newbies or when one has some questions or doubts about making changes into the Ubuntu desktop.
Nevertheless, I would recommend it for people considering quiting Windows for good and don’t know how to use Ubuntu. They will find out for sure that it is a good experience and will be overwhelmed about how simple it is to use it.

The Ubuntu Pocket Guide and Reference by Miguel Rentes' Blog, unless otherwise expressly stated, is licensed under a Creative Commons Attribution-Share Alike 2.5 Portugal License.