Can you locate any public or internal document that is on the internet or your intranet throughout your company? Once you get past a certain size, the Searchbox REST API makes that possible through access to its search services via the cloud or onsite. The API indexes raw content from a variety of sources.
The Google App Engine team has been consistently rolling out a new release every month recently. They have become so consistent in doing so, that new releases probably do not make that much of a splash. However, the team has pleasantly surprised everyone by delivering on one of the most requested features that developers had asked from their PaaS platform: Search. Yes, you read that right.