Try Choosing a Topic from the Purdue Online Writing Lab for some tips.
CQ ResearcherThis link opens in a new windowIn-depth coverage of current issues and controversial subjects.
Gale Opposing ViewpointsThis link opens in a new windowClick the View All option next to the broader category that interests you (Business and Economics; Law and Politics; etc.). Each topic will have an overview, viewpoint essays, magazine, newspaper, and journal articles.