Things that would help perl and the community, in no particular order, additionally to what you already do:
Answer questions from beginners, here or in IRC, mailing lists, newsgroups, ...
Walk through the perl rt and look at old tickets. Some of them have been fixed but not yet closed; close those (or notify p5p that they should be closed)
For errors with unknown source, bisect to find the responsible change
Raise funds for perl 5 development
The p5p plans to move to git as revision control system; that movement needs to be managed and supported by a few people with system administrator skills.
Smoke-test both perl and cpan modules
If you run on linux or *BSD, help your distributor to build and maintain perl packages. If you use windows, you can help the Strawberry Perl people, or even activestate (if they want help)
The perl foundation occasionally looks for people who support them with their paperworks, watch their blog and volunteer if you feel qualified