Was it the impressive pixel-dense screen or possibly the fact that someone decided to throw a quad-core processor into such a small package? The little tablet that could, Google's Nexus 7, proved that if you make a powerful, well-designed tablet with a user-friendly operating system, it will sell in droves.
Actually, the iPad proved that first, but the Nexus 7 showed that you don't have to be Apple to pull it off. The $200 price didn't hurt.
For more on this story, see our full Google Nexus 7 review.