Typing Tidepool on primarygames.com is a fun but hard game. Words pop up on the screen and you have to type them to make your dolphin go faster. You want to finish first with a fast time. The words get longer and pop up faster as you get farther in the game. It teaches you how to type really fast.
Math basketball at funbrain.com teaches you math problems. A problem comes up on the screen and you have to solve it. If you do, you make the pass. Then you dribble and shoot. When you score without missing a problem, you win.