"Modern Perl" =

• local::lib — install CPAN modules as non-root, or have cleanly-separated sets of module installs
• perlbrew — install newer versions of Perl as non-root, or have multiple cleanly-separated versions of Perl
• Plack/PSGI — an abstraction layer that sits in between web apps and the webserver — it allows webapps to run unmodified on CGI, FastCGI, mod_perl, or numerous other webservers