A lovely and powerful illustration. I really can't put in to words how excited I am for this 2048x1536 screen; I think my anticipation is on par with what I was feeling right before the iPhone debuted in 2007.
I've a strong sense that most people--even those who consider themselves gadget geeks--are not prepared for the sea change that this sort of pixel density (in a consumer screen this large) will bring about. The applications are limitless, and most of them haven't even been imagined yet.
If you aren't already using your iPad in lieu of your Mac (where possible), I suspect this screen probably will put you over the edge (even if that means always having to carry around a Bluetooth keyboard)... at least until Macs get similar displays.