The AAA is the major professional organization for anthropologists. The site has information on national conferences, careers, anthropology in the news, and recent publications.
The ASA is the major professional organization for sociologists. The site has reviews of departments, statements on issues such as immigration, welfare, and affirmative action, and career information.
The SfAA is the organization supporting applied anthropologists whether they work in academia, public service, or business.
You'll find a number of policy issues at this site with great overviews and fact files.
The American Museum of Natural History is another good place to look for anthropology internships.
The Smithsonian has internship opportunities and excellent access to resources.
Listing of Graduate Schools in Anthropology, search for programs by country, state, etc.
Listing of Graduate Schools in Sociology, search for programs by country, state, etc.