Just read an interesting article in The Economist and thought you might find it interesting. It is built around a paper by Tyler Cowen (an economist from George Mason University) where he claims that innovation and great ideas are slowing down and not driving growth. The Economists article presents arguments on both sides of the fence. There are some fascinating points made, in particular about how effective is R&D is today compared to 60 years ago and have really big ideas that change the way we live come to an end.
Hope you enjoy it.