Given the growing number of documents available and heterogeneous data structures used for storage, information retrieval has recently faced and dealt with new applications. In this book, Melucci and Baeza-Yates presents the results illustrate a wide spectrum of latest research in advanced areas related to information retrieval. aggregate search, digital advertising, digital libraries, the discovery of spam and opinion, in the context of information retrieval, resource discovery of multimedia, quantum mechanics is applied to information retrieval, scalability challenges in web search engines, and evaluation of interactive information retrieval. All chapters are written by renowned researchers, truly independent and comprehensive, and comes with a bibliography and subject index are integrated. With this selection, the editors give the survey the most up-to-date topics not usually discussed in depth in the traditional (text) books on information retrieval.