Audiovox VBP-2000 Video-In-A-Bag with 5-Inch LCD TFT Screen
Must have for those with little children
This has been a lifesaver for me on long car trips and short ones.  It is very compact compared to the others.  I also tried the RCA one but it does not fit between the front seats like this one.  That one sits in the middle of the back seat.  Does not work if you have a van.  I highly recommend this product.