  We present a catalog of bulge, disk, and total stellar mass estimates for
~660,000 galaxies in the Legacy area of the Sloan Digital Sky Survey Data
Release 7. These masses are based on a homogeneous catalog of g- and r-band
photometry described by Simard et al. (2011), which we extend here with
bulge+disk and Sersic profile photometric decompositions in the SDSS u, i, and
z bands. We discuss the methodology used to derive stellar masses from these
data via fitting to broadband spectral energy distributions (SEDs), and show
that the typical statistical uncertainty on total, bulge, and disk stellar mass
is ~0.15 dex. Despite relatively small formal uncertainties, we argue that SED
modeling assumptions, including the choice of synthesis model, extinction law,
initial mass function, and details of stellar evolution likely contribute an
additional 60% systematic uncertainty in any mass estimate based on broadband
SED fitting. We discuss several approaches for identifying genuine bulge+disk
systems based on both their statistical likelihood and an analysis of their
one-dimensional surface-brightness profiles, and include these metrics in the
catalogs. Estimates of the total, bulge and disk stellar masses for both normal
and dust-free models and their uncertainties are made publicly available here.
