Society for Science and the Public
Science News for Students: Like Electricity, but Magnetic
Describes research using magnetic monopoles that could one day lead to devices powered by magnetism or magnetricity, the name scientists have given this type of energy.
Harvard University
Boston University: Magnetic Monopoles
Informative, nontechnical questions are provided as well as answers regarding magnetic monopoles. This is a very useful site for getting an introduction to the search for these theoretical particles.
Wolfram Research
Wolfram Science World: Magnetic Monopoles
Some information about the search for magnetic monopoles, and how they are involved in a few different theories and postulations.