Sociological Abstracts: A primary database for research in sociology and related areas. Click on the "peer-reviewed" option to limit your results to just that type of journal article. The search boxes allow you to combine concepts to narrow your search. Example: political attitudes AND college students.
PsycInfo: Covers all areas of psychology and is also a primary database for research in family studies and human development. Click on the "peer-reviewed" option to limit your results to just that type of publication. The search boxes allow you to combine concepts to narrow your search. Example: social anxiety AND treatment effectiveness.
Academic Search Premier: Also known as Ebscohost. Covers a wide variety of journals in all subject areas including the social sciences. Also covers a lot of popular magazines that are not research-based, so be sure to click the box for "scholarly peer reviewed articles". Use the "advanced search" option to search more effectively.
SocIndex with Fulltext: Searches the same way as Academic Search Premier, but adds coverage for some additional social science journals. You may want to search both databases for a more comprehensive search. Remember to use the "advanced search" option and to click on "scholarly peer reviewed articles".
Dissertations: Proquest Dissertations and Theses database
Polling Sources: Check out this list of sources here, especially the iPoll Databank from the Roper Center for Public Opinion
Statistics: ProQuest Statistical Insight is just one of many places to find statistical sources.
Legal: Nexis Uni; There are links on the left to both U.S. and international legal materials.
Newspapers: Good list of newspaper databases here, especially Nexis Uni and Access World News.
Literature Reviews: Can be found in many places, but a good source is Annual Reviews. Coverage in many different disciplines, but all can be searched together in one easy interface.