This issue of Psychiatric Services includes five articles and one brief report on emergency services, an important source of care for persons with mental illness living in the community. Gregory Luke Larkin, M.D., M.S.P.H., and coauthors used data from the National Hospital Ambulatory Medical Care Survey to describe trends in mental health-related visits to U.S. emergency departments over the period 1992 to 2001 (page 671). Jagoda Pasic, M.D., Ph.D., and colleagues, in a sample of 761 high utilizers of psychiatric emergency services, determined sociodemographic and clinical characteristics associated with high utilization (page 678). And in a study reported on page 685, Ralph A. Catalano, Ph.D., and colleagues used emergency department visits, a widely cited effectiveness indicator in the mental health sector, to assess the impact of capitated financing. In another study (page 691), Cynthia A. Claassen, Ph.D., and associates examined whether the implementation of managed care in a public mental health system would influence return visits to the psychiatric emergency department after an index visit. On page 699, Dale E. McNiel, Ph.D., and Renée L. Binder, M.D., report on their study of relationships between homelessness, mental disorder, violence, and use of psychiatric emergency services in a sample of 2,294 in San Francisco. Finally, in a brief report on page 743, Linda L. Carpenter, M.D., and coauthors report on a survey of patients' expectations of psychiatric emergency services, in light of previous findings of use of emergency departments for nonurgent care.