As the 21st century begins, gravitational wave astronomy is poised for unprecedented expansion and discovery. This workshop focussed on ground-based gravitational wave detectors and the astrophysical sources they are expected to observe. The main purpose of the meeting was to bring together gravitational wave physicists, astronomers, astrophysicists, and numerical relativists to assess the current state of the field, and to provide a forum to generate future strategies and collaborations.