Good on you!!!

A friend of mine has just gone back to the UK with her DD 5y/o and DS 2y/o... she was telling me that you can get them games to play(obviously this is better for your little one), but wrap them as presents first (lots of sticky tape) that way they have to get through all the wrapping paper first and then get to the game - might buy you an extra 1/2 hr... i know thats not much on the long haul, but its one idea to keep them occupied.

At least now there are personal TV's and video games, when we moved over from the UK my sister and i were 5 and 7, movies were adult ones and there was no way we could see the screen... the hostess's i seem to rememebr were great and we got activity kits (do they still do that for kids on long hauls?)

Good luck, you will be fine, and if not dont worry the other people on the flight will get over it - and if they dont at least you wont have to see them again :P
Have fun