Sephora has a great app for the iPhone and iPod Touch. I have it and love it. I downloaded it about two months ago after hearing about it from some fellow beauty bloggers on Twitter. It's one of the nicest, most functional apps I have - and it's free! But, not only is Sephora offering the app for free but a Sephora case for your iPhone 4G and 3G/S. You can pick it up in store or add it to your cart when you make a purchase at sephora.com. You can learn more about it here. I don't know how long this offer will last so if you want it, jump on it!