  In supersymmetric theories, the presence of axions usually implies the
existence of a non-compact, (pseudo)moduli space. In gauge mediated models, the
axion would seem a particularly promising dark matter candidate. The cosmology
of the moduli then constrains the gravitino mass and the axion decay constant;
the former can't be much below 10 MeV; the latter can't be much larger than
10^{13} GeV. Axinos, when identifiable, are typically heavy and do not play an
important role in cosmology.
