We use MongoDB in the backend ourselves. But neither MongoDB nor CouchDB provide a nice interface for editors. You cannot ask non-technical content editors to

We use MongoDB in the backend ourselves. But neither MongoDB nor CouchDB provide a nice interface for editors. You cannot ask non-technical content editors to edit JSON manually and they don't want to edit content in a technical phpMyAdmin-like interface (believe me, we tried!). We provide an easy way for an administrator/developer to set up collections for different content types. They can choose between many different basic (strings, integers, ...) and advanced (attachment, image, location) fields and configure how editors can enter the content into the fields (including validations, so that an URL field really contains a valid URL). Developers can then query the content from their mobile applications on different platforms. In the future we will also provide open-source libraries for iOS/Android to make the integration even easier.