Each week Joshua Fruhlinger contributes This is the Modem World, a column dedicated to exploring the culture of consumer technology. "No worries, we can watch this movie on my iPad on the plane," I announced with confidence. "Oh really? Cool. Let's do that!" she replied, proud of her little nerdy man. Yup. I was cool. I was going to rip a DVD that we just bought to watch on my iPad on a long flight to Korea. How amazed would she be when that movie so easily pops up on the Retina display as we ease into complimentary wine and processed air