Panasonic DVD-L50 Portable DVD Player
It rocks!
I bought this unit about 3 months ago on a whim and it has been fantastic.  It's great for long flights although you will probably want to get an extra battery if you're going to be up in the air for more than 4 hours.   I've also found myself watching 2 to 3 DVD's a week at home which has been  great--especially since I don't own a TV.