Vim6.x user manual (Score 1)

If you issue ':help frombook', you will see that the user manual distributed with vim6.x is actually based on the book:

Many thanks to Steve Oualline and New Riders for creating this book and publishing it under the OPL! It has been a great help while writing the user manual. Not only by providing literal text, but also by setting the tone and style.

The difference is that the ':help user-manual' is actively maintained and describe all the new 6.x features.