  Data from Type Ia supernovae, along with X-ray cluster estimates of the
universal baryon fraction and Big Bang Nucleosynthesis (BBN) determinations of
the baryon-to-photon ratio, are used to provide estimates of several global
cosmological parameters at epochs near zero redshift. We show that our estimate
of the present baryon density is in remarkably good agreement with that
inferred from BBN at high redshift, provided the primordial abundance of
deuterium is relatively low and the Universe is flat. We also compare these
estimates to the baryon density at z = 1100 as inferred from the CMB angular
power spectrum.
