Games with mean, median and mode http://www.bbc.co.uk/schools/ks2bitesize/maths/activities/modemedianmean.shtml
Data picking http://www.bbc.co.uk/education/mathsfile/shockwave/games/datapick.html
Fun games using math questions http://www.bbc.co.uk/schools/ks3bitesize/game/
Gamequarium has many games and quizzes related to Data http://www.gamequarium.com/data.html
Cool Math Sites- has many links to different sites and games (go down to probability and statistics) http://cte.jhu.edu/techacademy/web/2000/heal/mathsites.htm