I call them storyboreds, because I'm usually bored at work when I do these. Nothing too elaborate here, although the color is a nice touch to make elements stand out. You'd think I'd catch sh** for doing this at work, eh? One of the (few) benefits of working in a call center.
These are shots from an air battle sequence. Following the advice of mdotstrange I did these on a stack of recipe cards. Doing 3 frames on a card lets me convey a sequence easier than doing 1 large frame per card, and once I have enough cards done, it's mix and match time until I get a sequence that makes sense. Fill in the gaps here and there, and i can build a sequence up over time.