How is it that I haven't posted these here yet? Anyway:
I keep forgetting I have various innate bound spells (Battle Prayers, wizard wagon weapons) until I've blown all of my power dice (if I'm lucky; I normally remember them several phases after that).
So, knocked together a couple of cards to print out and put with my various spell cards to keep track of them. There's one for Battle Prayers, the Luminark, and the Hurricanum. They should print out to be the same size as the spell cards (3" x 4 5/16").
If you've got a copy of the Empire book, grab 'em here. (If you don't have the Empire book, you probably shouldn't.)