Congratulations, you've made it through the class! So where do you go from here?
Well, first, I hope you'll consider buying the book (CGI Programming 101). The book contains lots more material, covering more advanced CGI topics like random ad or image generation, cookies, and database interaction. Order a copy today!
Also, please Rate This Class for the CGI Resource Index!
For further Perl reference, I highly recommend Programming Perl, by Larry Wall, Tom Christiansen and Randal L. Schwartz. This is the official "bible" of the Perl language; it's an invaluable reference, and really a must-have if you plan to do more advanced programming with Perl. It covers all aspects of the language - functions, syntax, regular expressions, standard modules, and lots more.
I also suggest the Perl 5 Pocket Reference, written by Johan Vromans and published by O'Reilly. This tiny handbook is a great reference to Perl's essential functions, packed into 68 pages.
There are a number of other excellent Perl/CGI books available; check out the books page for a more complete list.
Serious Perl coders will want to subscribe to The Perl Journal, a quarterly publication devoted to the Perl programming language. Visit http://www.tpj.com/ for more information.
And last but certainly not least, visit http://www.cgi101.com/ for source code from the book and class; links to additional resources, updates, online instruction, CGI-friendly web hosting, and more.