Weak lensing: revealing the dark side of the universe

Weak gravitational lensing, the deflection of light from distant
galaxies due to all intervening mass along the line of sight, is one
of the most direct ways to observe dark matter.  As a result, in the
past decade, weak lensing has become a very important tool both for
constraining cosmological parameters and for revealing the connection
between galaxies and dark matter.  I will begin by reviewing some
recent, significant observational advances related to both galaxies
and cosmology that were made possible by weak lensing.  Next, I will
outline some of the challenges and opportunities facing the lensing
community in existing and upcoming imaging surveys.  I will conclude
with some perspective on how these challenges will be addressed to do
ground-breaking work in the fields of cosmology, galaxy formation, and
galaxy cluster formation and evolution with weak lensing observations
in the next decade.