Without question, one of the greatest new technologies the world has to offer is in-flight Wi-Fi. There’s hardly anything more liberating than knowing your six hour haul from NYC to SF will be eased with Wi-Fi access — though an AC outlet would surely be nice. At any rate, research company In-Stat has issued a new report suggesting that nearly 800 airplanes will feature in-flight Wi-Fi by the end of 2009, and that the business will generate some $47 million in revenue worldwide.In reality, 800 doesn’t sound