Evaluating Internet Resources
nCriterion #9:  Evaluation of Quality of Links
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nThe person/s responsible for link selection should have the expertise and credentials to critically evaluate their appropriateness.  
nThe site “architecture” or design of pointers to linked sites is important for ease of navigation.
nThe content of links should be accurate, current, credible, relevant.  The content of the originating site is enhanced if it includes links to high-quality sites.
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Examples of Questionable sites:

http://www.hans.org/  (If you look at the fact sheets on this site -- none are dated.)

http://www.cc.columbia.edu/acis/bartleby/bartlett/
Bartlett's Familiar Quotations -- this is a terrific resource, but you may or may not notice that it's the 1901 edition!  (The header, bibliographic link and front matter link all clearly say 1901, but people could miss that.  What do you think?)

http://www.chem.utah.edu/MSDS/msds.html
This site actually warns you that the information may be outdated.  It also has a thorough disclaimer.