Very relevant article in the NYTimes today about how people don’t pay attention or even look up when talking to each other nowadays - in professional and personal contexts.
Beyond missing what the other person is saying to you…it’s just rude. Whatever happened to looking at the person when he/she is speaking directly to you? It may sound old fashion but it seems relevant more today than ever before.
http://www.nytimes.com/2011/04/17/fashion/17TEXT.html?_r=1&hp