"Post-PC" is the term Apple used at its iPad 2 unveiling to describe it's iOS products, and you can find an excellent analysis of what the term describes here.
Basically, post-PC is about user experience as opposed to horsepower, it's about delighting your users with your products, making things smooth and easy and all in all, just making your product feel good to use.
For gaming, in a way this is what consoles is to the PC (even though Steam is taking the PC a bit in the post-PC direction, and it's getting motion controls too). Consoles are straightforward and simple (relatively anyway), and the direction is emphasized by all the motion controls we now have. Before Move and Kinect came out, the Wii would have been much more of a post-PC product than the Xbox 360 or the PS3, but with the new add-ons, the gap has closed to the point where I think everyone is heading this direction more or less.
And while Apple is only coining the term now, Nintendo has been riding this wave (sort of at least) since it released the DS in 2004, and all it's "bringing more smiles" PR is only nailing it down even more.
So post-PC isn't about motion controls, touch screens, games or hardware, it's something that is essential in gaming now. Nintendo (DS, Wii, 3DS), Apple (iOS, OS X "Lion") and Microsoft (Xbox 360 w/ Kinect, WP7) are all riding high on the post-PC wave, and Sony is getting in on it (NGP looks like a nice step in that direction, as is the Move). It's all about differentiating through experience rather than hardware, and it's a strike at the current PC setup (or rather, Windows and Linux) as well as Android (with the hardware race being a big factor for new products).
So, are you for or against what this term represents? Not just in gaming, but in general with computers, smartphones, tablets, etc.











