In addition to the site mentioned already, I would specifically single out Ovid's CGI Course (Update: Oops! I was beaten to it!). In addition, I would suggest http://learn.perl.org and / or the most useful Learning Perl book.

perl -pe '"I lo*`+$^X$\"$]!$/"=~m%(.*)%s;$_=$1;y^`+*^e v^#$&V"+@( NO CARRIER'