I tried to standardize on AA's only, mainly because of the advantages of the lithium cells--light weight, long shelf life, large storage capacity (relatively). Unfortunately, two essential items in my kits take AAA's only...my Tikka/Zipka's and my Sony FM/AM/TV/Weather radio. I really wish that the manufacturers of this kind of equipment would realize that the vastly greater power capacity of the AA's over the AAA's makes the AAA cell rather useless in comparison.

For example, an Energizer AA is rated at about 2850mAh versus 1250mAh for an Engergizer AAA. That means a AA packs about 2.28 times as much energy as a AAA!

It should also be mentioned that I try not to rely too much on battery powered devices. You can only carry so many batteries. But here's what I do have:

AA's
2ea Motorola Talkabout 6250 GMRS/FRS radios (and an FCC license, to boot)
1ea Sony ICF-SW7600G shortwave radio
various lights (CMG's, Mag's)

AAA's
1ea Petzl Zipka (and/or Tikka, I have one of each)
1ea Sony SRF-M37V FM/AM/TV/Weather radio

At least, that's the important stuff--but then, of course, there's the cell phone (proprietary Li-Ion) and the Photon's (lithium coin cells); however, in the first case, I don't expect the cell phone to last longer than a day, and in the other, the coin cells are small and light enough not to be a bother.