I have not had my surgery yet (Im planning for sometime in Jan or Feb 2011) but I have the same problem of eating even after I know Im full (of course the amount that makes me full is WAYYY too much). I think mine is because I was raised as a member of the "clean plate club". In other words, if the food is on the plate, you still have food to eat, you arent finished with a meal until the plate is empty.
Since I dont have the band yet, my suggestion might prove useless but here it is....
You might try setting yourself up with two "servings". Example, if you are going to eat a 1 to 1-1/2 cups of food, prepare only 3/4c. Eat that then if you still are hungry go fix 1/3c more. Just remember to take your time eating, but not take so long that your stomach starts to empty and you have to start filling it all over at the same meal.
Hope this helps! Sometimes it helps me, sometimes it doesnt, usually I get tired of going back so many times, but thats what my band will be for, to help me get to the full point with less food/trips.