  This proceeding concentrates on the BAO signature of dark energy, and how the
SKA dark energy case has been complicated by the emergence of HI structure
experiments modeled after the Epoch of Reionization observatories. The purpose
of the conference talk was to review the current status of the Murchison
Widefield Array (MWA), and show the applications of HI structure observations
for both reionization and dark energy measurements. Since the status of the MWA
is changing weekly, please see the website www.haystack.mit.edu/ast/arrays/mwa/
for the current status. This proceedings will instead concentrate on HI
structure observations, their applicability to reionization and cosmography,
and the implications for the SKA and future HI structure observations of dark
energy.
