Did you ever use flashcards?

I remember using flashcards to memorize the multiplication tables. My father wrote them out on 3x5 cards and would sit by the bed each night quizzing me on a different set of numbers. As I became proficient at various cards he would remove them from the stack. Once they were all in the proficient stack it would be time to read or go to bed. Since that time I have used flashcards many times on various subjects. When I wrote Memorize-It, I kept this in mind and even since then I have used Memorize-It for a number of topics. I made sure that the quizzing aspects included the ability to focus on the hardest information by giving more repetition on the hardest cards.