Web Credibility 
Is the website you are using a good one? Remember, not everything you see on the internet is accurate. Check out websites before you use them as a resource. Think about the following:
Can you identify the author? What are the author's qualifications?
Can you identify the publisher? Is the publisher a well-known and respected authority on your topic?
How current is the information? Is the information consistent with the information you are finding at other sources? Does the website provide links to their sources? Is there a bibliography?
Can you contact the author/publisher/webmaster?
After reviewing further criteria for an acceptable website here, click the links to the websites below and complete the Critique Guide on two of the websites. You can download the Guide here.
Read the varying opinions about the popular "wikipedia" site at the links below:
http://www.dba-oracle.com/t_credibility_wikipedia.htm
http://en.wikipedia.org/wiki/Credibility
http://bonariabiancu.wordpress.com/2007/02/18/credibility-of-wikipedia/