Especially excited at the idea of a single store. I've always had a little bit of a beef with Flux when it came to interdependencies within stores.

I feel like one of the problems with react that is currently not well solved is the integration of a client and server side router for a truly isomorphic application. There have been quite a few implementations that rely on a single om-like state that they serialize and deserialize to the client. Relay feels like it would fit extremely well into this paradigm.