Data Mining Books
The following are the books I think very useful for beginners as well as advanced researchers in data mining field.
Data Mining: Concepts and Techniques, Second Edition

Authors: Jiawei Han, Micheline Kamber
Publisher: Morgan Kaufmann Publishers
This may be the most known data mining book. I recommend especially to beginners.
Introduction to Data Mining

Authors: Pang-Ning Tan, Michael Steinbach, Vipin Kumar
Publisher: Addisson-Wesley
Grouping Multidimensional Data: Recent Advances in Clustering

Authors: Jacob Kogan, Charles Nicholas, Marc Teboulle (Editors)
Publisher: Springer
There are other books I really like. I’ll introduce them later.