American Alliance of Museums - is the one organization that supports all museums. Through advocacy and excellence, the Alliance strengthens the museum community. We support 21,000 museums, individuals and companies.
American Institute of Graphic Art - Founded in 1914 as the American Institute of Graphic Arts, AIGA remains the oldest and largest professional membership organization for design and is now known simply as “AIGA, the professional association for design.”
Art Network - "Teaching artists the fine art of marketing art."
Creative Career Search - LOTS of links for creative types: visual arts, entertainment, performance, poetry, etc....
Creative Jobs Central - It costs to join, but it has job postings in everything from acting to sports... might be worth it!
Graphic Artists Guild - Costs a bunch to join ($75 for student membership), but might be worth it
Kennedy Center - The Kennedy Center offers several types of internships and fellowships for individuals at varying stages in their arts administration careers. Programs specifically for individuals with disabilities are listed on this site.
MusicMoz - Great site with links to all aspects of the music business, including labels, promotions, event planning, etc.
Show Crew Network - Show Crew Network is the personal booking agent you never had. Get booked, manage your availability, payments, job details and more! Get started and create a profile in minutes and put the Network to work for you.