Links

History

This is one of the best all around sites that I have found. It is titled "The MacTutor History of Mathematics Archive."
http://www-history.mcs.st-and.ac.uk/~history/

This is an award-winning site that links to all sorts of mathematics information.
http://archives.math.utk.edu/

Reference Topics

This site presents the "Odd Ball Problem" of Example 2 in the text.
http://www.cut-the-knot.com/blue/OddCoinProblems.shtml

This site presents the "Prisoner Problem" of Example 5 in the text.
http://ola4.aacc.edu/kehays/problems/tpp.htm

Here are some fun logic problems, along with their solutions.
http://www.austincc.edu/rgrmth/logic.htm