SmartGlass won't be available to consumers until the fall, and if the reviews of the feature's capability are any indication, it's going to feel like a very long wait. SmartGlass lets you switch from watching something on your TV to watching it on your tablet or smartphone, and vice versa. But that's only the beginning. SmartGlass also lets developers turn smartphones and tablets into Xbox 360 controllers. Thus, if you're playing a sports-based game with your friends, you can enter your strategic plays into your smartphone, so he can't tell what your team is about to do. Or, with a baseball ga...