I should add, anyone with a laptop already knows how nice a warm keyboard is to use ;)
My hands sweat when I use my MacBook Pro, so I'm not quite fond of a heated keyboard tbh.
Bah to this, it has one of these wimpy small backspace keys. It is not adequate!
I'd be more worried about the layout around the enter key more.
Anyways, not a bad idea, didn't think about the health benefits as stated by vinyl.