Probabilistic Topic Models

In the CACM:   Somewhat Technical, but some valuable insights:  " ...   Surveying a suite of algorithms that offer a solution to managing large document archives .....  As our collective knowledge continues to be digitized and stored—in the form of news, blogs, Web pages, scientific articles, books, images, sound, video, and social networks—it becomes more difficult to find and discover what we are looking for. We need new computational tools to help organize, search, and understand these vast amounts of information.... "