Examples of enterprise applications using Rest on Rails

Could you describe some examples of a REST on Rails enterprise applications that you may have come across or just in general?

My work generally deals with consumer-level web applications - we don't do enterprise development very often. As a result, I don't have any existing applications to point to.

The enterprise chapter of my book talks more about the possibilities REST (for example, wrapping a complex SOAP interface) and Rails (e.g., with rapid prototyping) provide.