Libraries have begun a transformation from physical materials to electronic media, and the so-called next-generation catalog is emerging before our eyes. This issue of "e;Library Technology Reports"e; analyzes five different academic libraries to better understand their investments, detailing the outcome thus far and drawing conclusions about the next-generation catalog. Topics Include: * Defining the Next-Generation Catalog: Open Source versus Commercial Solutions * Deploying the Next-Generation Service * Understanding the Impact * Case Studies (Wake Forest University , Oklahoma State University, North Carolina State University, University of Tennessee at Knoxville, and Villanova University)