This volume originated at the 10th Granada Seminar (a series of small topical conferences whose pedagogical effort is especially aimed at young researchers), held at the University of Granada, Spain, September 15-19, 2008, and contains the main lectures and a selection of contributed papers in that conference. This is the tenth of a series of Granada Lectures previously published by: World Scientific (Singapore 1993), Springer Verlag (Berlin 1995 and 1997) Lecture Notes in Physics volumes 448 and 493, Elsevier (Amsterdam 1999) Computer Physics Communications vols. 121 and 122, and the American Institute of Physics Conference Proceedings Series, volumes 574, 661, 779 and 887. These books and the successive editions of the Seminar since 1990 are described in detail at http://ergodic.ugr.es/cp/. An effort has been made by authors and editors to offer pedagogical notes in the present book. In particular, each topic is comprehensively described and, eventually, some practical exercises are proposed. We try to mold the Granada Lectures into a series of books that help introduce the beginner to novel advances in statistical physics and to the creative use of computers in scientific research, as well as to serve as a work of reference for teachers, students and researchers.