Although this book could be updated since it was originally published, it still offers tons of great information for the biz traveler!
There are insider stories that only a biz traveler or travel staff would know. These stories will help you throughout your travels.
There are several website mentioned in the book (and another reason it should be updated since the web is a constant growing animal!). The websites provide shortcuts to obtaining your travel needs and information.
I recommend this book to any biz traveler. I personally found it handy by recognizing several things I could've done better to help me survive on the road (i.e. ever need a copy center in the middle of the night?).