After a year plus deprecation period and one extension to the official cutoff date, Dropbox has officially retired the Dropbox API v1. v2 has been live for quite some time and Dropbox has been promoting its consistency, simplicity, and scalability to entice developers to move to the new platform.
Google has announced several very interesting updates to its Book Search tools, including an embeddable viewer for book previews and a data API. These should open-up a wide range of book-related applications. This follows-up on Google's release in March when they launched the first API for Google Book Search, the Book Viewability API.