Other than a few that you mentioned, here are the ones that I have been putting off using:
- Parse::RecDescent - I tend to do most of my parsing with split and regex (and specific modules, such as HTML::Parser, etc), and I can usually get what I need done without much problem. However, I often get the feeling that familiarity with Parse::RecDescent could save me tons of work.
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Win32::* - I work in Windows a lot of the time, and it would be nice to know what I could actually use it for (Windows, I mean) ;)
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POE - For all of the attention it gets, it HAS to be good, right? :) But seriously, reworking code to use this module might be very handy if I find myself forking off waaaay to many processes.
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Inline - Because its so damn neat.