Panasonic DVD-LS90 9-Inch Portable DVD Player
Great little DVD player
I bought this player primarily to watch DVDs while on flights and it certainly does the job well.  The picture quality is excellent and the battery charge lasts long enough to view 2 movies.  The battery is not a standard battery, however, and you will have to buy another expensive Panasonic battery if you want a spare but I haven't found this necessary yet.  I haven't found any negatives at all with this player other than the proprietary battery, and that is a very minor negative considering the length the charge lasts.