Urban legends/myths may or may not be related to scams, they may or may not be fun or funny, but they are apparently a constant of everyday life, as well as a source for serious academic study. One web site (http://urbanlegends.com/ ) is especially useful, no matter what your need or reason, since it lists other web site and is kept up to date.
Specific sites which appear to be stable and contain large enough files to be useful are: http://www.snopes.com/snopes.asp
The (in)famous Darwin Awards folks have a section on urban legends, since their awards are so often imitated, see it at: http://www.darwinawards.com/legends/
http://www.museumofhoaxes.com is a site of famous hoaxes of the past, one I love to look through.
To check out reported computer virus and related matters, you can find out about both real and imagined problems at http://vmyths.com
And, along the same lines there is “scam busters” which attempts to warn consumers about unscrupulous business scams http://www.scambusters.com/backissues.html
Adrien Taylor, Reference Librarian