Showcase mini-wikipedia's like @cscott's MiniWiki (talk slides), possibly @Jhernandez' webkipedia as well.
Also/or example of converting parsing requests to RESTbase
Maybe merge API:Styling content or refer to it.
Jan Eissfeldt commented
Most cases I handle want to reuse either the articles, especially through the mobile-friendly format and the new REST API, to mirror WP under circumstances where it is not readily available (Burkina Faso, mainland China, West Africa), or simply get partial data sets to feed their own apps/app proposals.
That reflects that most folks I deal with aren't by default coders who do stuff in their free time but institutions like ISPs or other corporates.
He remarks "people get stuck how our data is licensed, and what the latter means"
There have been quite a few mobile prototypes using REST API content, and the apps are using RB content exclusively. There is also work under way towards an API driven mobile web frontend. Lets call this one done as far as showcases are concerned.