Finally, my new picture dictionary for iPad, Alphazed, is available on the iTunes App Store. Free worldwide, it makes use of Creative Commons images, linking back to the original photographers and to the wikipedia entries. There's a colour, an animal, a place, a food and an object for every letter of the alphabet, and they're not the first ones you'd think of.
If you like it, please rate it!
I can think of no more succinct way to show the importance of graphic design principles than this.