E-Book readers (or potentially ebook readers). You can see from this photo that the iPad doesn't make a good ereader... the screen is extremely reflective.
Don't buy the jetbook. The firmware has to be reloaded nearly every time you sync it with the computer. Here you can see it has crashed... it crashed immediately when the first person tried to open a book and could be not be recovered by resetting. The owner had to take it home and reload the firmware. It has many outstanding features but is practically unusable due to the bugs.