One of the big things that Dropbox missed with the Datastore API is the collaborative aspect. Creating a distributed database that you can use on any device is

One of the big things that Dropbox missed with the Datastore API is the collaborative aspect. Creating a distributed database that you can use on any device is great, but without the ability to share data between users, you’re stuck building apps in an empty sandbox. With Harmony (and its potential collaboration API) it seems that Dropbox could become a real distributed platform for single-page-apps.