As the use of the Internet increases worldwide, mental health services are frequently being accessed on this medium. In addition, more Internet media are being used for establishing and maintaining relationships and as a primary and timely means of communication. Following a review of the history and range of various technologies used for mental health services, the role of the Internet in the provision of these services is described in lights of its clinical, ethical, and legal challenges and implications. Also discussed are the opportunities that arise as a result of the unique features of the Internet such as ease and speed of access, and the application of various Internet technologies to natural disasters and emergency situations. The significant potential of the Internet for enhancing the ability to more rapidly respond to these situations is introduced. Implications for the future of the Internet in the provision of mental health services and for responding to emergencies and natural disasters are addressed.