I'll have to agree with Slav here. Why do you think that all coaches use their play sheets to cover their mouths when they are calling plays? That's because teams used to hire lip readers with binoculars to read their lips and call the plays in to the defense. Now we have telephoto lenses that can read them from the coaches box. Plus they can read the play sheets themselves. This is far from a new thing for coaches to do. The Patriots were just dumb enough to get caught. Think about it this way. When that many millions of dollars are at stake per game or season, don't you think Robert Kraft, Jerry Jones or Al Davis are going to use any means necessary to win and guarantee that those ad dollars keep coming in?
BTW, I'm glad the Patriots got booted so soon. Screw them.