We are pleased to present a third Yearbook. The 2000 Yearbook treats two themes, both of which relate to newer features of the media landscape: violence in video and computer games, and pornography on television and on Internet. Some articles in the Yearbook also discuss findings on audience perceptions of violence and sex in the media. The choice of these themes has to do with the marked increase in the availability of such content to children and youth via new media technologies.