Have you ever type in darkness. I guess that everyone did it at least once in life. So I have an innovation for computer's hardware designers. Why we can't create keyboard with highlight like it is used in mobile phones? What do you think about this? It will have unusual appearance and in addition such keyboard will emphasize individuality of the owner.
As in addition special software of this keyboard could operate with highlight and you will see only those characters that accounts with previous. For different languages it will be different. I think that this feature will tutor people type quickly.