Writing about the Internet is, of course, like trying to hit a moving target.
Books take time to edit, design, print, and distribute.
Some things are bound to change while that as happening. That's one of the main reasons for this Web site. The online version of The Practical Nomad's Travel Resource Guide on this site includes updated listings and links to all the resources listed in The Practical Nomad book series. There have been extensive changes, of course, in the services offered by Internet travel companies. Many never will be.