Was at Barnes and Noble with my wife and I always check on the Linux computer book section to see what’s new there. The section is always surrounded/swamped by the Microsoft Press books, but found the Official Ubuntu Book 3rd edition, special Barnes and Noble edition.
As mentioned earlier this edition has an entire chapter dedicated to the Ubuntu Forums but also contains a Kubuntu 8.04 CD showing off KDE. Only disappointment is the Kubuntu version is not the KDE 4 version but the official KDE 3 version.
Go out and pick up the book today.