You know, if any of these mailing lists had some sort of rules (and some do) that say "No job postings allowed", I wouldn't post, but they don't, so when I have an HTML5 job in NYC or San Fran, etc., I post the job to the list and ya know what, not everyone complains. I get many a worthy candidate from my postings. My clients need developers and designers and IA's, etc., and I find them for them almost exclusively via mailing lists, but shhh, don't tell my competition or everyone will be doing it.