in reply to Programs/Methods for analyzing an existing Perl based system

What other tools exist for analyzing a Perl program?
[...]
Variable cross-reference

strange that no-one mentioned this: 

perl -MO=Xref yourscript.pl

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Update:
System summaries (lines of code, file statistics...)

I haven't tried it, but Perl Metrics seems pretty good at statistics, although unfortunately it doesn't appear to be actively mantained.

cheers,
Aldo 

__END__
$_=q,just perl,,s, , another ,,s,$, hacker,,print;

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In Section Seekers of Perl Wisdom