Pro or Con? - Databases and sites to help with pro/con research topics and issues
SIRS Issue Researcher - You want full coverage of the most spectaularly debated topics? Look no further.
Times Topics from the NY Times - with articles going back to 1981, this reputable site collects news, reference and archival information, photos, graphics, audio and video files published on all sorts of topics. That's a fact, Jack.
Procon.org - a site for critical thinking and to educate without bias. Procon.org researches issues that are controversial and important, and presents them in a balanced, comprehensive, straightforward, transparent, and primarily pro-con format. BOOM!
Pew Research Center - Pew Research Center is a nonpartisan fact tank that informs the public about issues, attitudes and trends shaping America and the world. It conducts public opinion polling, demographic research, media content analysis and other empirical social science research. Yeah, that's what I'm talkin' 'bout.