[RSnyder]

It would be really useful if there was a list of which devices were driven by which battery.

Easy enough. Everything is powered by the HV battery when in Ready. Most via the DC-DC converter which powers the 12V system (and recharges the 12V battery at this time). Only the two motors, the DC-DC converter, and the A/C (2004 only) are connected to the HV side. Everything else runs off the 12V side.

When not in Ready, every thing that still has power is powered by the 12V battery.