  Baryon acoustic oscillations, measured through the patterned distribution of
galaxies or other baryon tracing objects on very large (100 Mpc) scales, offer
a possible geometric probe of cosmological distances. Pluses and minuses in
this approach's leverage for understanding dark energy are discussed, as are
systematic uncertainties requiring further investigation. Conclusions are that
1) BAO offer promise of a new avenue to distance measurements and further study
is warranted, 2) the measurements will need to attain ~1% accuracy (requiring a
10000 square degree spectroscopic survey) for their dark energy leverage to
match that from supernovae, but do give complementary information at 2%
accuracy. Because of the ties to the matter dominated era, BAO is not a
replacement probe of dark energy, but a valuable complement.
