If you have access to the Science journal, do not miss the Review article written by Elbio Dagotto in the latest issue (July 8, 2005). This is the most concise article on THE major issue in condensed matter physics today. Strongly correlated electron systems comprises of a number of novel and research-front area that include high-Tc superconductors, collosal magnetoresistance, magnetism, metal-insulator transition (especially in the Mott-Hubbard system), etc. Not only that, these areas of study exhibit the complexity or emergent phenomena that led Phil Anderson to claim that "the ability to reduce everything to simple fundamental laws does not imply the ability to start from those laws and reconstruct the universe." This article also convey why the study of high-Tc superconductors, for example, is important BEYOND just its boundaries. This material is the poster-child for strongly correlated system. It exhibits almost all of the exotic properties of such a system. So the understanding of these superconductors have implications in understanding other families sharing the same complexities. A strongly-recommended article to read. Zz.  E. Dagotto Science v.306, p.257 (2005).