In an era when half of all new HIV infections occur among people under 25, The Complete HIV/AIDS Teaching Kit ($95, Springer Publishing Company)   helps high school and college instructors teach entry-level prevention. Diverse experts from across the country tackle everything from biology to stigma to viral vocabulary. POZ’s report card:

Pros: A CD-ROM with PowerPoint slides and homework assignments; chapters offer quizzes and Web resources.

Cons: Lack of positive people’s voices and viewpoints.