  The Tevatron has inspired new interest in the subject of magnetic monopoles.
First there was the 1998 D0 limit on the virtual production of monopoles, based
on the theory of Ginzburg and collaborators. In 2000 and 2004 results from an
experiment (Fermilab E882) searching for real magnetically charged particles
bound to elements from the CDF and D0 detectors were reported. The strongest
direct experimental limits, from the CDF collaboration, have been reported in
2005. Less strong, but complementary, limits from the H1 collaboration at HERA
were reported in the same year. Interpretation of these experiments also
require new developments in theory. Earlier experimental and observational
constraints on point-like (Dirac) and non-Abelian monopoles were given from the
1970s through the 1990s, with occasional short-lived positive evidence for such
exotic particles reported. The status of the experimental limits on monopole
masses will be reported, as well as the limitation of the theory of magnetic
charge at present.
