JMich: Why no TI99/4A in the picture? Or do they consider it a PC and not a console?
ChrisSD: The distinction between a console and a PC has often been a bit blurry. Some would argue the distinction is starting to disappear entirely.
To me the difference between a gaming console and a (gaming) home computer (including PCs) is that with the latter anyone can become a developer, without buying any additional devkits etc.
So for example, many Commodore 64, Amiga or x86 PC end-users also became game or application developers (or making their own music or demos with the system) without necessarily any extra investments, while NES and SNES gamers remained as gamers (content users, not creators). I think there were some special Playstation units which let you also develop Playstation software, but those are beside the point.
That's why I also consider e.g. iPads and Android devices to be closer to consoles than computers, because they seem to be aimed solely for consuming apps and games made by others, not making your own with the device. I presume the people who are actually developing apps for smartphones/tablets are doing them on PCs and Macs, not on tablets themselves (some iOS/Android developer probably knows better)..
I'm sure someone will come up with a Wikipedia article proving that my definition for a home computer/PC is flawed, but meh.