Let's be clear here. Are you referring to the performing arts/ theater? There are plenty of jobs available outside of the performing arts industry ... but if you wish to remain in the industry, try the following sites:
ArtSEARCH: The National Employment Bulletin for the Arts
Find positions in universities, colleges and schools; museums; arts councils; and more -- including full-time, part-time, seasonal, year-round and internship opportunities, from entry level to upper management.
American Association of Community Theatre
Artslynx
Americans for the Arts Job Bank
Backstage Jobs
Educational Theatre Association
PropPeople
Screen Actors Guild
Showbiz Jobs.com
Stage Managers Association
The Art and Science of Theater
The Shakespeare Theatre
American Theater Web
Broadway Stars
CT Opera
Lyrical Line
Musical Theatre International
Music Publishers' Association
National Alliance for Musical Theatre
New York Musical Theatre Festival
Actor's Equity Association: Casting Calls
Children's Theater Links
Mandy.Com
Playbill.com