"Favorite" is a little difficult. How about ten (or so) of the ones I cannot live without -- not including my own :-)

• CPAN
• Template Toolkit
• DBI
• mod_perl
• File::Find
• LWP
• MIME::Lite
• Test::More
• Getopt::Long/Getopt::Std
• Data::Dumper
• Class::Accessor

And how about a few I'd like to learn but don't have the time or the project to devote to them?

• POE
• SOAP::Lite
• Alzabo
• AxKit
• Parse::RecDescent
• LWP (yes, it's on both lists)
• Filter
• Inline

Chris
M-x auto-bs-mode