This article clearly explains what constitutes a quality educational game. The formula includes "focusing on a targeted curriculum" and using higher order thinking skills. Problem solving is usually the main focus. Students should be "intrinsically motivated" by the game and be able to "master the learning goals behind the game."
Interesting article that discusses how our brains change when using Web technologies. The term "partial attention" is explained as "a state of constantly scanning for information." Insightful description of how our world has changed significantly now that technology is here to stay.