[lukenyc]

Yapp is built on Ember and it has been a joy. Terrific community and a lovely layered design that lets you work at the level of abstraction appropriate to the interaction you are building. We have ember-data in production in selective places, and it definitely has a ways to go to deliver on its full promise. That said, you can't really build an ambitious app without some model/persistence concepts, or without an identity map, so it is a big win for that already.

The common refrain that I hear talking to people in NYC and the wider internet world is that people want Ember what Ember promises and has begun to deliver. More and more of those folks (including my team) are rolling up their sleeves to help make it fulfill its promise.