This is a sketchy outline of the planned book contents:

Cover (Front page, text license...)
Index
Foreword
Introduction
  What is a web questionnaire?
  What is Mod_Survey?
  Terminology
About Mod_Survey
  A brief history
  What does Mod_Survey support?
  What does Mod_Survey *not* support?
  Different versions of Mod_Survey
  Comparing Mod_Survey with other systems
  How to get access to Mod_Survey
Basic working with survey files
  Requirements
  The life span of a survey
  Writing a survey file
  Uploading the survey
  Accessing the survey
  Administrating the survey
  Downloading data
Writing questions
  What is a question?
  Static lead-in texts
  Closed single-choice questions
  Multi-choice questions
  Open questions
  Scales
  Matrices
  Designing custom question types
Color and decoration
  Themes
  Stylesheets
  Global layout settings
  Extra HTML markup
  Graphics
Collecting automatic data
  Non-visible "questions"
  Inserting constant values
  Fetching data from the environment
  Date, time and timing
Restricting access
  Setting up user files
  Access levels
  Managing respondents and unique answers
Surveys with more than one page
  Unbranching multipaging
  How variables are handled
  Conditional branching with IF
  Conditional branching with CASE
  How to fail miserably with a branching survey
Dynamic contents
  Inserting data from answers
  Perl snippets
Using databases
  Why would you want to use a database?
  Setting up DBI
  Syntax and tweaks for DBI
  Letting repondents delay answering
Downloading and using survey data
  The data module
  The HTML export
  The SPSS export
  ...
  Importing data in Excel
  Importing data in Access
  Importing data in SPSS
Troubleshooting
  ...
Acknowledgements
  About the author
  People who contributed to Mod_Survey
Appendix 
  Short installation instructions
  Migration guide for 3.0.x users
  The GNU General Public License