Welcome to the Constellation-X Observer. The Observer provides information about the current state of the mission, including recent progress on instrumentation and other items of interest such as the Constellation-X science updates for the Decadal Survey. Each issue will also contain a "Focus On" section that highlights Constellation-X science, paired with powerpoint slides which we hope you may find suitable for inclusion in your next talk on this science. If you have material appropriate for a "Focus On" section, please contact the editors at conx-observer@lists.nasa.gov.