A good research topic should have depth, along with many details and aspects to research. Midway College provides a list of 100 research topics, and some examples include: the efficacy of abstinence programs, the sexualization of toady's advertising media, and how Africa can overcome it's challenges regarding civil war, poverty and famine.
Air plane accidents make for great topics to research, as they are heavily documented allowing one to discover a large variety of information on the subject. The pros and cons relating to the legal drinking age in the United States could also make for exciting research. There is an interesting argument that the drinking age in the U.S. should be lowered from 21 to 18.
Other topics that might be of interest are beauty pageants, which have come under scrutiny by feminist groups; divorce laws - should the process be easier or more difficult; or human interest pieces on the conditions of child laborers and child soldiers around the world, given that many countries in the third world have very different ideas of what it means to be an adult versus what it means to be a child compared to more developed nations.