Wikipedia: Intersexuality - User-created article discusses the history of intersex people in society, notable intersex people, prevalence in society, and more.
Intersex Society of North America (ISNA) - Devoted to systemic change to end shame, secrecy, and unwanted genital surgeries for people born with atypical reproductive anatomies.
NOVA: Sex: Unknown - Presentation detailing the life of Max Beck, a man who was raised as a women. Site investigates the complicated world of gender identity.