Some of the documentation is not entirely upto date, and the book is fairly out of date, and it takes a little user-diligence to find what has happened since 1.0 -> 2.2 or 3.0 (yeah, I know, CHANGELOG.txt, but that assumes you have found what you were looking for and decided to download ;).
The change logs are actually quite impressive, and if nothing else, the work done deserves the applause of a sticky ;)
We added a link to the recent CHANGES file to the Documentation area of the TBB site. And I added a sticky forum thread with the link to that area. Would you find this satisfactory for new users to quickly discover the information they need?