This is kinda old, I think, but it's pretty great. A rant by Bret Victor on the Future of Interaction Design.
From the rant:
... There's a reason that our fingertips have some of the densest areas of nerve endings on the body. This is how we experience the world close-up. This is how our tools talk to us. The sense of touch is essential to everything that humans have called "work" for millions of years.
Now, take out your favorite Magical And Revolutionary Technology Device. Use it for a bit.
What did you feel? Did it feel glassy? Did it have no connection whatsoever with the task you were performing? ...
Go read the rest!