Barnes & Noble Nook HD and HD+ hands-on

Back and forth, back and forth. So Amazon and Barnes & Noble have gone, in an endless game of one-upmanship over the last few Kindle- and Nook-filled years. That’s why when Amazon announced the Kindle Fire HD, the clock started ticking toward its rival’s inevitable retaliation. And retaliate it has, as Barnes & Noble announced today two new tablets aimed head-on at the two Kindle Fire HD models: the Nook HD and Nook HD+.