ok, you are taking on one big project- each piece of gear is different basically. i think your page should focus on a few areas- first off determining what the draw is off a device- also how to combine that equation for multiple devices drawing off one battery.
Then i really think there needs to be a section on SLA's vs NiCads and also Rechargable AA's. What kinds of chargers are good, which suck, etc.
I'll think of more as time goes on.