Other Parts Discussed in Thread: TPS61029
I've been very impressed by the TPS61029 regulator. The current output appears to be one of the highest in its class when used with a single AA. I was a little surprised there wasn't an EVM for it, so I made my own board. The design files are currently available here:
hackaday.io/.../7050-boostick-small-aa-voltage-booster
Or if you'd prefer to just buy a built up version there's a currently funded Kickstarter to order a bunch of boards.
https://www.kickstarter.com/projects/1710326172/boostick-small-aa-voltage-booster
After the Kickstarter is over, they'll be up on Tindie.