The Nook HD+ has a 9-inch screen with a 1,920x1,280-pixel resolution (256 ppi) -- the same as the 8.9-inch Amazon Fire HD. The Nook HD+ starts at $269 for the 16GB version. It jumps to $349 for the 32GB model. It comes in one color ("Slate"). Both the Nook HD and Nook HD+ have expandable memory.
In their presentation at the launch event, B&N reps showed how the narrower dimensions of the Nook HD (compared with Kindle Fire HD) made it a better fit for those with smaller hands. They also touted how the dimensions made it better suited for one-handed operation.
Previous Nook Tablets charged via a standard Micro-USB port. Alas, the new Nooks have a custom 30-pin connector. They do come with a charging cable and an AC adapter. On the left is the microSD card slot. It accepts up to 64GB cards.
Both Nooks run a heavily skinned version of Android 4.0 (Ice Cream Sandwich) with new interfaces. You cannot access the Google Play store. Barnes & Noble has its own curated app store with about 10,000 apps.