ExcitedSam-choice of movies-lots depending on who you fly with, but on any airline at least 4 or more recent (last 3-6 months) and then back catalogue of older (past 2 years or so) or really old favourites-choice of at least 10-often up to 20 including mix drama, kids, comedy, action. The best part of the trip-my DD and I always excitedly open up our entertainment guide and plan the trip-and panic as it won't be long enough to fit in all we want to watch! On a typical US western seaboard flight we fit 2 movies in each way plus some TV shows. If you aren't aware there are always TV shows as well but that is very airline dependent as to how good a choice you get-always some of the most popular comedies/sitcoms-often Friends, Two and a Half Men, How I met your Mother, Glee etc. Often includes marathons too so get 3 or 6 episodes in a row and then there's always some reality TV and docos like cooking shows, travel features (saw a great one on Harden in China ice sculpture festival once), random odd things.
On our April Japan trip (no diff to going to US entertainment wise) I watched New Year Eve and Sherlock Holmes 2 on the way over and The Kings Speech and Hugo on the way back.