United Airlines is upgrading passenger comfort with lie-flat seating, and the Business cabin gets cool gadgets like new 15.4-inch LCDs, a USB port, and an iPod adapter to let you charge your iPod and play your own music and videos on the seat’s entertainment unit. You will have 20 channels of "stored XM audio," with an additional 30 channels of other "stored audio." They will even give you noise canceling headphones. No word on meals though…