  We present an overview of the electroweak physics program of the SLD
experiment at the Stanford Linear Accelerator Center (SLAC). A data sample of
550K Z0 decays has been collected. This experiment utilizes a highly polarized
electron beam, a small interaction volume, and a very precise pixel vertex
detector. We present a preliminary result for the weak mixing angle,
sin2(thetaw)=0.23110 +- 0.00029. We also present a preliminary result for the
parity violating parameter, A_b = 0.898 +- 0.029. These measurements are used
to test for physics beyond the Standard Model.
