I'm not Cecil Adams or Barbara Mikkelson but I enjoy bringing truth to the unenlightened or misinformed masses. The two people above represent the two best sources I've found on the web for doing that.

Snopes is a site where David and Barabara Mikkelson debunk (or confirm) urban legends. If there's a claim that you are skeptical of, it is usually a good place to check it out. One of the many oft-heard stories that I doubted was the rumor that sorority houses are prohibited or limited in number by brothel laws. I was happy to be able to use Snopes to show that was not true.

Another site I found recently is The Straight Dope. I don't read the newspaper so some people may already be aware of this, even though I wasn't. Cecil Adams is supposedly the smartest man alive and can answer any question. He has been writing this syndicated column since the 70's where he answer's peoples questions with the mission of fighting ignorance. The webpage is a bit poorly designed. The most useful pages I have found are the archive (scroll down) and special reports which are not actually written by Cecil but a staff.