  With the advent of large, deep surveys, the observation of a strongly
gravitationally lensed supernova becomes increasingly likely. High-redshift
surveys continue apace, with a handful of type Ia supernovae observed to date
at redshifts of one or greater. In addition, a satellite (the
Supernova/Acceleration Probe [SNAP]) has been proposed dedicated to observing
thousands of supernovae per year out to a redshift of 1.7. Although it is
exceedingly unlikely that we will see a multiply-imaged supernova from ongoing
surveys, we find that SNAP would observe at least eight such events per year.
Since having a standard candle is inessential to most lensing studies, SNAP's
large sample of type II supernovae contributes to this rate. Each case of
strong lensing allows for a precise determination of time delays, image
separations, and relative image magnifications, and the SNAP strong-lensing
database will offer measures of $\Omega_m$, $\Omega_\Lambda$, and $H_0$,
independent of SNAP's primary goal of establishing the distance-redshift
relation. These systems also constrain models for the matter density profiles
of galaxies and clusters. Furthermore, lensed type Ia supernovae afford the
opportunity to break the mass-sheet degeneracy found in many lensing
measurements.
