Use these points to evaluate the credibility of Websites:

Accuracy 
How reliable is the information? Are there editors or fact checkers?

Authority
What are the author's qualifications?

Objectivity 
Is the author trying to sway opinion?  Is the information biased?

Currency
Is the publication date indicated? Is the source up to date?

Coverage 
Does the site cover the topic comprehsively, or are there gaps?

Sites that provide guidance on evaluating Websites:

• Trust it or Trash it?
• The Good, the Bad, and the Ugly, or Why It's a Good Idea to Evaluate Web Resources
  New Mexico State University Library
• Thinking Critically about World Wide Web Resources
  UCLA College Library