Random House API

From their site: Random House has created the Insight Service: a set of programming tools that allow internet applications to view and search digitized book content. Through the Insight Service, keyword searches can get inside actual book content and find matches against the full text of the book. Insight can then serve up the pages of the book in different formats depending on the needs of the developer: for example, pages can be displayed in high-quality image formats for optimal viewing or speedy little thumbnails for quick review.