In a highly connected, easily searchable world, depending on a resume alone might put you at a competitive disadvantage. You might want to rethink that.
If you happened to Google search me, you would find my CPAN directory and a few other things I've done. Is that good enough for you? This discussion is largely theoretical.
It's more important to me that you (1) know when to ask for help, (2) know how to ask a question, and (3) listen carefully.
Number 1 isn't answerable online, except for people who have few "real-world" acquaintances to ask. For those people, you can get a good idea of number 2. With number 3, you eliminate the real flaming idiots. For everyone else, you face something like Warnock's dilemma... did they listen carefully and understand, or ignore the answer and simply give up?
I don't think that finding a bunch of meaningless "community involvement" in the form of newsgroup blather and such is very significant. I find it disturbing that employers want to base their decisions on something that's easy for them to check, whether or not it actually gives them any real information. How do you manage to hire any decent people at all? I realize you probably get a whole lot of resumes to look through, but that doesn't make me any happier about the situation.