Here are some things to look for when you're evaluating a Web site or a source other than an article found through a library database, book, etc.
Simply speaks to the recency of published information. Is the information outdated for the topic you're studying?
Locate the author of a publication, Web site, etc. Is he or she qualified to speak on a given topic?
Sometimes a sponsor will have a hidden agenda. This is something that I learned when looking for the Center for Consumer Freedom (CCF) in SourceWatch.
Ties in with authorship and sponsorship. What is the intent of the Web site or publication?
Is the information found on a given Web site, book, etc. accurate? If an author lists the wrong dates for World War I, the accuracy of the remaining information is thrown into question.
Hacker, Diana, and Barbara Fister. (2009). "Tips for Evaluating Sources." Bedford/St. Martin's.com. Bedford St. Martin's, n.d. Web. 19 Aug. 2011. Retrieved from http://www.dianahacker.com/resdoc/tips.html.Quaratiello, Arlene, and Jane Devine. The College Student's Research Companion: Finding, Evaluating, and Citing the Resources You Need to Succeed. New York: Neal-Schuman, 2011.