Playbill Online
Go to this site and then click "Casting and Jobs." You'll have to register, but there are dozens of NY theatre jobs listed here.
NYC Commision on Film, TV, and Theatre "Tech List"
Click on "Tech List" under "Production" to see a listing of film, TV and theatre jobs.
Entertainment Careers.net
A job and internship listing for studios, networks, production companies, record companies, etc.
ESTA Job Board
ESTA is the Entertainment Services and Technology Association, and this is a great job source for jobs with manufacturers and suppliers.
ICIA Job Links
The ICIA is the pro A/V market's trade association.
Mandy
Film/TV production guide also has job listing service.
Media Match
This is a paid job listing service for film/TV freelancers.
Gigs List
Paid service for arts/entertainment jobs.
Interfacio
Interfacio provides a personal global recruitment service for commercial, technical and management positions.
BackstageJobs.com
Great free job site.
MIDI & Audio Industry Job Board
MIDI and Music Technology Jobs
Variety Careers
Variety is the Entertainment Industry's predominant news magazine. A large listing in many entertainment industry categories.
Craig's List - tv/film/video/radio jobs
TV-Film-Radio job listings from craigslist are on this site.
Craig's List - crew gigs
This site has "Crew Gigs" for a variety of live performance jobs.
JobsAV
This service specializes in AV, Networks, and Communications jobs and is affiliated with Infocomm and CEDIA.
C-Deck Designs
Cruise Ship Entertainment Jobs