This is an interesting article that appeared at The Guardian (a very well-known British newspaper): Emails 'pose threat to IQ'. It talks about a study made that points that the constant lack of focus that you get currently because of the amount of assynchronous information you receive is very alarming. It is an interesting point! But I'm not completely sure how to deal with something like this, though... How to make emails, cell phones, etc. less intrusive in our concentration? Sure you can turn them off, but the problem is that our society is getting more and more towards creating devices that are always on, and always reachable. We want to be found, we want to be interrupted!
One good thing about this article: I can blame on something for feeling more and more stupid!