  We present calculations of the single-particle excitation spectrum for a 2D
strong-coupling superconductor in a conserving approximation. Spectral weight
at low frequency is substantially reduced as the superconducting transition is
approached from the normal state. The suppression of low-energy excitations is
a consequence of Cooper-pair fluctuations that are described self-consistently
in the fluctuation exchange approximation. The static and uniform
electromagnetic response provides a measure of the super fluid density and a
fully self-consistent indication of the superconducting transition temperature.
