The home page of Count on maths year web site (UK)
An online (and downloadable) maths problem generator to practice for 60 seconds- pity there's not a hi-score table as well!!
Easily Create Math Worksheets, Quizzes, and Tests; Specializing in Addition, Subtraction, Multiplication and Division. MathCreator provides you with the ability to create printables at a variety of elementary and middle school levels.