Kerntype is an amazing HTML5 website that make kerning typefaces into a fairly competitive game. It's been making it's rounds in the office and I find it amazing that such a simple game can grab so much (well deserved) attention. Even it's own company wide leader board.
The concept is simple, you're presented with a word in a certain typeface and you are then asked to adjust the spacing between the letters to achieve a visually pleasing result. You are scored on the difference between a preset "perfect" kern position, once you complete all 10 levels you are graded on a score of 100.
Using simple games like this makes it fun and enjoyable to learn about subjects, and using HTML5 technologies makes it easier to turn your ideas into reality.
Check out some of the other games from Method of Action: