Apple's three million new iPad sales in the opening weekend are impressive but not particularly surprising; what the company has really demonstrated with the third-generation tablet isn't that it can create a coveted product, but that it can now deliver in bulk. Stock shortages have plagued Apple launches since the original iPhone, the company seemingly unable to meet demand for its high-profile phones and tablets. In fact, it's become a measure of success for stores to sell out and lines to snake outside for days and weeks as would-be owners queue desperately for the rationed hardware. Still, while "sell-out success" makes for good press hyperbole, turning customers away empty-handed isn't best for business. With the new iPad, though, Apple showed that the supply chain just got serious.