Get on board and ask the stewardess for a serving tray. I've done this when i carried my PDA, Discman, Michael Crichton Prey all at once
I placed the tray upon the food tray but I dont think you can do this because the LCD will not open fully - especially if, like investorguy said - the guy in front turns out to be a jerk.[u]BEST OPTION :
Go there early and get the seat by the emergency door - window mind you. This way no leaker asks you to get your stuff out of the way just because he wants to reach the aisle.
One you are there the seats dont recline so the guy in front wont have a prayer if disturbing you is his intention
Then all you need to do is find a pretty stewardess and get her tray...
Best of luck!!!