Kidzware.com has a cool flash application up at http://www.kidzware.com/math-game.html. The game is a Math Drills preparatory exercise used in Chesterfield Co. VA. Students have to correctly answer 36 questions in less than 3 minutes to get into the Hall of Fame. Each Level is actually a grade level requirement. Level 1 should be completed by the end of first grade, level 2 by second, etc...
Good program, but maybe make a mixed excercise, with all of your current excercises, or something like that. But it is rather good, and I'm sure a lot of children will benefit from this.