Camera, Cell Phone, Laptop, iPod, all the chargers for that stuff, pen, paper, 3-4 bottles of juices, snacks, earbuds (with 1 to 2 prong adapter), memory cards, colonge or anti-perspirant spray. Ativan for relaxation/sleep (only if desperately needed)

Enjoy the ride. I'd love to sit on planes for a looong time, but I'm crazy and love flying/aviation so that's a different story.