  Black hole binaries exhibit dramatic changes in their X-ray spectral and
timing properties over time, providing important clues about the physical
processes that occur in these systems. Black holes and black hole candidates
are prime targets for RXTE with observational goals including the study of
extreme gravitational fields and jet formation mechanisms. The great wealth of
data from RXTE has helped us to learn about these systems as well as raising
new questions about accreting black holes. RXTE observations have allowed us to
study a wide range of black hole science topics including the connection
between the accretion disk and jets, the geometry of the inner accretion flow,
and the physical changes that occur between spectral states. In this
presentation, I discuss significant results on these topics that have been
obtained for persistent and transient black holes over the past several years,
and I present results from our program of X-ray and radio observations during
the decays of black hole transient outbursts.
