Depixelizing Pixel Art
I wish they would use this in Windows 8.  As far as I can tell, their scaling algorithm for 4k displays is: scale up 2x using nearest neighbor, then randomly drop pixels to get back to 125% or 150%.  The result is horrifyingly bad.  Not just kind of bad, but unusably bad.  (Adding insult to injury, they ClearType the text before scaling.)