Polymer, a Web Components library built by Google
I was at the Google IO talk and talked to Matt McNulty, my old boss from Palm, and was blown away with what they're building.This is the future of UI in the browser.The declarative nature, the encapsulation, the data bindings, the attribute and event-driven APIs are all orders of magnitude simpler than existing JavaScript / HTML UI element componentization. The reusability of a custom element compared to an HTML snippet with some associated JavaScript and CSS cannot be overstated.EDIT: understated > overstated