I can't hold up with Limbic~Region's impressive list, but I did and do a few things (not sorted by anything).

• I write tests for Perl 6 (mostly) and Perl 5 (a few)
• I wrote some CPAN modules
• I answer perl questions on perlmonks, in two other boards and on IRC
• I blog about Perl, mostly Perl 6
• I contributed various small fixes, doc fixes and enhancements to perl and several modules
• I give other perl hackers feedback on their work, websites and blog posts
• I try to be nice
• I mentored a Google Summer of Code project for TPF
• I provide infrastructure for other perl hackers: administer servers, offer public IRC logs, write websites etc.
• I teach Perl 6 to anybody willing to listen :-)