Questions to ask:
Author
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Is the name of the author or creator on the page?
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Are his/her credentials listed (occupation, years of experience, position or education)?
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Is the author qualified to write on the given topic? Why?
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Is there contact information, such as an email address, somewhere on the page?
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Is there a link to a homepage?
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If the author is with an organization, what kind of organization is it?
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What does the domain name/URL says about the source of the information?
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If the owner is not identified, what can you tell about the origin of the site from the address?
Purpose
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Who is the intended audience?
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Scholarly audience or experts?
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General public or novices?
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If not stated, what do you think is the purpose of the site? Is the purpose to: Inform or Teach? Explain or Enlighten? Persuade? Sell a Product?
Objectivity
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Is the information covered fact, opinion, or propaganda?
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Is the author's point-of-view objective and impartial?
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Is the language free of emotion-rousing words and bias?
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Is the author affiliated with an organization?
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Does the author's affiliation with an institution or organization appear to bias the information?
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Does the content of the page have the official approval of the institution, organization, or company?
Accuracy
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Are the sources for factual information clearly listed so that the information can be verified?
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Is it clear who has the ultimate responsibility for the accuracy of the content of the material?
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Can you verify any of the information in independent sources or from your own knowledge?
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Has the information been reviewed or refereed?
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Is the information free of grammatical, spelling, or typographical errors?
Reliability and Credibility
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Why should anyone believe information from this site?
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Does the information appear to be valid and well-researched, or is it unsupported by evidence?
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Are quotes and other strong assertions backed by sources that you could check through other means?
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What institution (company, government, university, etc.) supports this informatio?
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Is there a non-Web equivalent of this material that would provide a way of verifying its legitimacy?
Currency
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If timeliness of the information is important, is it kept up-to-date?
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Is there an indication of when the site was last updated?
Links
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Are links related to the topic and useful to the purpose of the site?
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Are links still current, or have they become dead ends?
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What kinds of sources are linked?
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Are the links evaluated or annotated in any way?
Conclusion
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Be very critical of any information you find on the Web and carefully examine each site.
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Print out or download pages you plan to use in your research so that your bibliography will be complete and accurate.
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Web pages are susceptible to both accidental and deliberate alteration, and may move or disappear with no notice.
(from Georgetown University Librariy website at http://www.library.georgetown.edu/tutorials/research-guides/evaluating-internet-content)