The constant need to be “plugged in” remains a concern especially with respect to driving while texting/emailing/etc. In August 2009 the New York Times published a game which purports to measure how your reaction time is affected by external distractions, such as texting. We recommend you try it, your results may surprise (and scare) you!
http://www.nytimes.com/interactive/2009/07/19/technology/20090719-driving-game.html?_r=1&