Electronic flash cards

Develop a device that is similar to a palm pilot that can be used as flash cards.  This would consist of a key board and nothing else, it would be use for kids study who use flash cards but instead of paper it is electronic.  Then there could be a "quiz" function that takes your eFlashcards and randomizes them and then quizzes you.  You would not have to file them or lose them, everything could be saved on it.