A new version of the Boeing jumbo jet 747-8 is in production to be released next year. In the last four decades, this family of aircraft has transported 3.6 billion passengers, or the equivalent of over half the world's population.
On a related topic, Gilt Groupe is reporting that iPad alone generates 4% of its revenues. Pretty impressive!
NFC is still a few years away from becoming reality because of (1) the switching costs for customers. They need to be re-trained and become comfortable in paying with their smartphone, (2) costs incurred by merchants to make their POS NFC-aware, (3) incentive for handset manufacturers to include NFC in their devices.
Is Groupon really worth the astronomical valuation, especially given intense competition, lack of differentiation and barriers to entry? They probably wish they had just taken google's buyout offer.