Wisely realizing that the public would riot and turn the plane over if forced to go a full flight without petting an e-puppy or doing some multiplication, the airport makes clear with this sign that the console has not been banned. The extent of the law is that you should keep the DS turned off during take-off, and refrain from using any wireless connectivity. That's ... not a big deal at all. It is pretty funny that the poster doesn't mention, or seem to apply to, any other handheld game consoles or laptop computers. Maybe those problems just don't come up.
