It's called the Padnote and it looks like an iPad. Basically, what it is is a notebook that is useful for drawing and such.
iPad lookalike for $7.00!!!!
From the Mainichi Daily News:
The notebook with gridlines is designed to facilitate drawing. In collaboration with a printing firm near the college, they have managed to imitate the exterior appearance of the iPad, including its texture and control buttons.
The product went on sale online in May, and gained unexpected popularity for its unique design and cheap price of only 735 yen apiece.
The notebook has been available at Tokyu Hands Department stores (wasn't there when I went to buy!) but, if you want one, you can inquire here: firstname.lastname@example.org