  QCD-motivated models for hadrons predict an assortment of "exotic" hadrons
that have structures that are more complex then the quark-antiquark mesons and
three-quark baryons of the original quark-parton model. These include
pentaquark baryons, the six-quark H-dibaryon, and tetra-quark, hybrid, and
glueball mesons. Despite extensive experimental searches, no unambiguous
candidates for any of these exotic configurations have yet to be identified. On
the other hand, a number of meson states, one that seems to be a
proton-antiproton bound state, and others that contain either
charmed-anticharmed quark pairs or bottom-antibottom quark pairs, have been
recently discovered that neither fit into the quark-antiquark meson picture nor
match the expected properties of the QCD-inspired exotics. Here I briefly
review results from a recent search for the H-dibaryon, and discuss some
properties of the newly discovered states --the so-called XYZ mesons-- and
compare them with expectations for conventional quark-antiquark mesons and the
predicted QCD-exotic states.
