I have a bunch of the old D cell lights, but, I find that with the evolution of smaller LED based lights, like some of the offerings from Fenix, I just don't reach for the big Maglights anymore. There's still a big 3 or 4 D-Cell in each of our vehicles (I did replace the bulb with Mag's drop in LED) but, it's probably more useful for breaking a window or in self defense...

I just seem to use the smaller lights, both for flood and throw needs. I either use a headlamp, on AAA's, or a small tactical style like a Fenix T10, which is on 123's, or a keychain light, on AAA's like a Fenix L0D. Of course, I've got a couple AA MiniMag's too, with the LED heads. I know I can get pretty good lights that are similar to the T10 that will run on AA's, or AAA's, but, the light intensity, size, throw, and, well, comfort/form of the T10 make it my favorite at the moment, so I'm stuck with 123's. I have a couple lights that use them anyway, an older 1 cell Nuwai, and a 3 cell from Cabella's that has an interesting square patterned lamp. I supposed if there's a shortage of one type of battery, I'll have something I can use!

I have some nice plastic holders for spare batt's that I picked up at County Comm. http://www.countycomm.com/CBH.htm They make them for AA and 123 size, hold 4 each. Good for throwing into a pocket of your BOB.