Introduction to Information Retrieval

The pre-publication text and companion PowerPoint slides to Introduction to Information Retrieval (Cambridge, 2008) by Christopher D. Manning, Prabhakar Raghavan and Hinrich Schütze is available here. 

From the web page:

The book aims to provide a modern approach to information retrieval from a computer science perspective. It is based on a course we have been teaching in various forms at Stanford University and at the University of Stuttgart.

The authors are seeking feedback on the book's use as a textbook.  The site includes a table of contents and links to PDF chapters.