  We are engaged in a program with the Cosmic Background Imager (CBI), a
13-element interferometer recently installed at 5000 m in the Chilean Andes, to
measure H_0 with 10% accuracy through observations of the Sunyaev-Zel'dovich
effect in a sample of nearby clusters. We discuss the capabilities of this new
instrument and present our cluster sample and selection criteria, along with
results from detailed simulations. We also present preliminary observations of
Abell 478.
