You probably expect that session management is often needed and thus a popular topic. Here are some available Perlmonks and CPAN resources:

• Categorized Questions and Answers
  • How can I maintain a session cookie?
  • How can I authenticate HTTP sessions?
• Tutorials
  • Tips for Using Apache::Session
• CPAN Documentation
  • CGI::Session::CookBook
  • CGI::Session::Tutorial

Also, you should try searching individual nodes for "session management" using Super Search. Good luck.