I thought I'd post some links... some resources for artists. I've been pouring over these sites recently looking for potential post-graduation opportunities. These links primarily pertain to job opportunities. More opportunity-related links to come...
New York Foundation for the Arts: art-related jobs, internships, residencies, and calls - primarily in NYC (but not everything)
Greater Philadelphia Cultural Alliance: art-related jobs in Philadelphia, PA
American Association of Museums: art-related jobs in the US (mostly upper-level jobs)
Arts Opportunities: art-related jobs, internships, residencies, and calls in the US (listings not as extensive as other on sites)
Alliance of Artists Communities: jobs associated with various artists communities/residency programs