I'm on a roll, aren't I? :) I have to confess that I've never been much into drilling with flashcards. But I probably say that to my own detriment. I can remember having flashcards as a child and enjoying going through them. Now that I'm an adult... eh, not so much. But I have to admit that this year we've been using flashcards more to increase Ian's speed in mental math.
Recently, I came across an idea for a math game, which is way more fun than drilling! We call it, "Make Ten". We use our Uno cards, just the ones numbered 1-9, and we try to pair up numbers that add up to 10, ala "Go Fish". Love it! :)