Shahram Javey, engineering manager for the Share team here at Adobe, built a very cool service using the Share REST APIs. The service allows accessing your Share Library, viewing documents and sharing documents all from your iPhone. Check it out at http://web.sharepdf.com. He talks about this in his blog.
This is really exciting and highlights the extensibility of the service. Shahram was able to take the vanilla Share APIs and build a prototype using these APIs in a just a couple of days. This is exactly the types of scenarios we have envisioned in opening up the service for use by developers and third parties service providers.