Issuing a perl -V command reveals the following directories in @INC on my Debian Sarge machine: 
/etc/perl
/usr/local/lib/perl/5.8.4
/usr/local/share/perl/5.8.4
/usr/lib/perl5
/usr/share/perl5
/usr/lib/perl/5.8
/usr/share/perl/5.8
/usr/local/lib/site_perl

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Can another Debian user kindly outline the difference between the directories and how to decide which modules should go where?

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In reply to What's the difference between the many @INC directories? by nysus

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