I used a Pro Mini board in a battery powered circuit and implemented some sleeping routines, I can get it to draw less than a milliamp while sleeping. I can't get an Uno board to draw anything less than about 10 or 12ma when sleeping, I'm guessing because of the onboard regulator.
Now I'd like to use the bigger Pro board instead of the Pro Mini. Does anyone know if the Pro has a low current draw like the Mini, or is it more like the Uno?