Now that font rendering technology on displays has reached that of print thanks to "retina" class displays, how can we improve readability even further? We're

Now that font rendering technology on displays has reached that of print thanks to "retina" class displays, how can we improve readability even further? We're no longer constrained by the limitations of the printing press. What if every vowel in a word were rendered in light grey, and every consonant in black? Or every letter were mapped to one of n subtle (near black) color hues? Or both? Such crazy schemes might further improve word recognition and reduce load on the visual cortex. Perhaps the Kindle, Readability, or iBooks could implement something like this as an experiment. I'd definitely try it.