in reply to Which non-Perl books made you a better (?:Perl )?Programmer?
The Elements of Style and the MLA Handbook -- because sometimes you need to plead your case to non-developers.
Strong ++ for Strunk and White. No matter what you're writing, it will make it better. Some of its concise, direct, no nonsense advice might even be applied to writing Perl and certainly to POD.
Original 1918 edition online here: Elements of Style.
Read a book on Perl
Written a book on Perl
Contributed to the Perl source code
Debugged someone else's script
Played Perl Golf
Used regular expressions to save the day
Used Perl for a certain amount of time (please specify)
Invested a certain amount of man-hours in learning Perl (please estimate)
Visited at least x Perl related events
(Co)maintain at least x active (up-river) CPAN modules
Forgotten you were not Larry Wall
One can never truly know Perl
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