How do you pass the time during a flight? What do you bring in your carry-on?
I either listen to podcasts that I have downloaded to my Nokia phone or I watch videos I have downloaded from online and encoded to the 3GP format for use on a Nokia N93. I wrote a procedure for how to do this on a Mac fairly easily, and you can see the results.
The flights I usually take are only an hour and a half in the air. When I went to Finland in October, I had a bunch of stuff encoded on my phone, laptops, whatever had a battery that could play these videos. :)