This book has six appendixes:
Appendix A is a mini-cookbook for mod_perl. Look here before reinventing the wheel; it's possible that someone else has saved you the hassle.
Appendix B is a listing of the Apache:: modules for use with mod_perl.
Appendix C is for Internet Service Providers who provide mod_perl support on their servers.
Appendix D is a tutorial on the Template Toolkit, a powerful templating system based on mod_perl.
Appendix E is a tutorial on AxKit, an XML application server based on mod_perl.
Appendix F is a listing of HTTP status codes.