How to See a Quark-Gluon Plasma with Quarkonia Measurements

I will review some of the implications on the quark-gluon plasma of 
heavy quarkonia measurements.  Color screening of charm-anticharm and
beauty-antibeauty pairs in the medium is a potential signature for 
deconfinement.  Alternative explanations of J/Psi suppression will also 
be explored.