My first contact with some sort of Perl community was through clpmisc rather than through PM. With this relatively small difference (s/PM/clpmisc/g - there are even contributors common to both!), I can support all of what I could read so far in other people's answers.

My coding style has not changed much since my arrival to the monastery. But of course you keep learning new things, even if at a most definitely slower pace if compared to the beginnings, when my coding style was literally forged by the good suggestions I got from more experienced Perl programmers; and every now and again real pe(a)rls pop out.

One that springs to mind immediately is something that I learned just yesterday, i.e. that perl not only "optimizes" (see Re^6: A refactoring trap, thanks to adrianh)

while (<$fh>) { ... }
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which I knew, but also

while (my $line=<$fh>) { ... }
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as well, which I ignored.

Also, (possibly) due to the fact my production of short utilities and quick hacks outnumbers "big projects", I've never really been much proficient in OO Perl programming, if you exclude the most basic concepts and techniques, whereas I keep reading interesting articles here about these topics, and I'm positive that my coding style may be positively influenced by them, as I slowly keep on reading them and learning...