  Upcoming observatories will be able to detect the kinetic Sunyaev-Zel'dovitch
(kSZ) effect with unprecendented signal-to-noise, and cross-correlations with
foreground signals such as galaxy counts are a promising way to extract
additional cosmological information. We consider how well a tomographic
galaxy-count cross-correlation experiment, using data from WMAP, ACT and SALT,
can significantly constrain the properties of dark energy. We include the need
to model a wide range of effects, including those associated with complicated
baryonic physics, in our analysis. We demonstrate how much of the cosmological
information contained in the kSZ comes from larger scales than that in the
galaxy power spectrum, and thus how use of the kSZ can help avoid difficult
systematics associated with non-linear and scale-dependent bias at k>1h
Mpc^{-1}.
