The majority of this book covers mod_perl 1.x, which was the stable version of mod_perl at the time of this writing. However, the exciting rewrite of mod_perl, Version 2.0, is near release and deserves special attention in this book. Although it may be some time before mod_perl programmers have completely embraced mod_perl 2.0, it's clearly the direction that mod_perl is taking.
Chapter 24 gives an introduction to Apache 2.0 and mod_perl 2.0, and shows you how to install and configure it.
Chapter 25 covers the new handlers in mod_perl 2.0 and how they are designed to be used.