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 forRXTEwith observational goals including the study of extreme gravitational fields and jet formation mechanisms. The great wealth of data fromRXTEhas helped us to learn about these systems as well as raising new questions about accreting black holes.RXTEobservations 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. © 2004 American Institute of Physics