1) Pure of Heart -- This CD set from Jason Evert is quite possibly the best presentation on chastity and purity I have ever heard. Jason utilizes the testimony of himself and others, saints' quotes, Pope John Paul II's Theology of the Body, common sense and a variety of other tools to explain purity (particularly the problem with pornography) in a way that particularly targets men.
2) God's Plan for You: Life, Love, Marriage and Sex -- David Hajduk breaks down JPII's Theology of the Body in a way that relates to teens.
3) If You Really Loved Me: 100 Questions On Dating, Relationships, And Sexual Purity -- This is the best summary of the most common questions on sexuality and chastity related topics. Jason Evert, a renowned chastity educator, answers each question thoughtfully and concisely, often drawing in humor and easily understood analogies.
4) Pro-Life, modesty and chastity apparel is available in some awesome designs. I highly recommend Stand True's store.
This is just a short list for now. What resources would you recommend?