jobs.perl.org has been very good to me over the years. Two of my last three permanent positions (this one happened to come from a headhunter approaching me via LinkedIn) came from there. In addition, I've gotten three short-term contracts as well. And I've always assumed it was because I was eminently qualified for the positions I aimed for. Now, I know otherwise.
My company is looking for another Perl programmer, one with strong MySQL as well. The CEO asked me to call upon my vast connections in the Perl community (*snerk*) to see if I could bring in a better calibre of candidate than what we had been getting from headhunters (present company excluded, I suppose). So my first impulse was to post the position to j.p.o. Heck, I even convinced the CEO to whip out a credit card and pay for front-page placement.
I've gotten three replies. One was from a recruiter wanting to send us a resume in exchange for a promise of a fee if we hired the person. One was from a person living in India who clearly missed the "on-site" part of the listing. But the one who really amazed was the person who replied "saw your job posting on craigslist" (no, you didn't), didn't provide a resume (even after I asked for it in three separate email messages), asked what the projected total hours were (missing the "full-time" part of the ad) and whether he could telecommute (at least the fellow from India only overlooked this one detail, and had provided a resume). It now looks as though my luck with the jobs site can be boiled down to the simple fact that I can read and follow instructions.
Perhaps this is just a corollary of what I warned the CEO initially: all the Perl programmers I know who are good, already have jobs. They are rarely unemployed for any period longer than they choose to be. And unfortunately for me, none are (currently) looking for work.