Describe your shots as the visuals come to you. Wherever they come to you. Then sketch them. While big sheets of paper may still be your favorite, you can't argue with portability for on-the-fly concept development.
Keep track of where and when the shots will take place, along with the corresponding page numbers of the shooting script. As an added bonus, the built-in location manager will allow you to cross reference your imaginary locations with their physical counterparts.
Updated Description:
In addition to a cosmetic overhaul, Ginger now features multiple project support (with arcology16 integration), expanded detail notes and a sketch gallery for an index browsing alternative.
Please note, all prior Ginger storyboards will work with version 2.0