  The Atacama Cosmology Telescope (ACT) project is described. This
multi-institution collaboration aims to produce arcminute-resolution and
micro-Kelvin sensitivity maps of the microwave background temperature over 200
square degrees of the sky in three frequency bands. We give a brief overview of
the scientific motivations for such a map, followed by a design outline of our
six-meter custom telescope, an overview of our proposed bolometer array
detector technology, and site considerations and scan strategy. We also
describe associated optical and X-ray galaxy cluster surveys.
