1. Pricing for iPhone (after the initial launch), iPod touch and iPad launch price. They aren't the most expensive "smartphones" and tablets. 2. App store app prices, especially for iPhones/iPod touch. They don't control the prices, but they provide a list to choose from and they indirectly influence pricing. See (3). 3. App store top X, what's hot, etc charts. Apps are sold exactly like mp3s.