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I'm already an expert in compiling perl. I have to be, maintaining Configure :)
I'm already pretty familiar with pack/unpack, POD, typeglobs, CPAN modules (and creating them), filing bug reports
I might be the heaviest format user worldwide (debatable), but part of the test code in perl5's core on that is mine.
I know some XS, but only to the extent that I need to know to maintain my XS modules. No plans to learn more, unless needed.
I defenitely want to learn more about the new regex functionality in perl5.10 (thanks Yves, also for the presentation).
Perl 6 (with the space) is defenitely not on my program, as function calls are rewuired to be written func() (without the space), which is a major show stopper for me (and all my colleages) as it violates our laws of readability for code.
My mind doesn't like OO object oriented programming in Perl. In fact, it doesn't like OO programming at all. Now that both DBI and Perl/Tk need it a lot, I have to do it, but I would prefer a non-OO interface.
functional programming in Perl, device driver programming in Perl, and interprocess communication in Perl might be addressed on a need-to-know basis.