On top of that, very few developers woild classify a smartphone as an embedded device (nevermind a tablet). Even if you consider Android to be a distinct OS, they inherit too many of the properties of a general purpose computer to be classified as anything but a general purpose computer.

Ereaders are a bit trickier to classify. I suspect the locked down devices, such as those from Amazon and Sony, should be firmly classified as embedded devices. Kobo's should probably be classified in the same way, but I am a bit uncomfortable with that since a modified configuration file gives you access to the device that behaves as a general purpose computer.