I signed up for the DiorDiva VIP last year. (I know! I totally forgot about it until my recent Dior cosmetics shopping spree!)
All you have to do is save your receipts whenever you purchase Dior cosmetics. Each dollar you spend equals one point and you can earn free samples, or even full size products! I'm sending in my receipts right now because I have 100 points. In 6-8 weeks, I'll be getting a bunch of deluxe samples! It'll be like Christmas in July!