Considering we have had an entirely new paradigm shift in front end development, I have yet to see anything that has blown my mind for usability or UI. Usually it's the same site and design except now it jiggles about as stuff loads asynchronously or repaints. I see way more degradations than I do improvements. I would love to see the creme of the crop, if anyone has any good applications using new tooling they think are a good example?