Google Nexus 7
Google made it out of the gate first with a 7-inch tablet, a compact size it proved has an enthusiastic market.
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.
For more on this story, see our full Google Nexus 7 review.