I thought about making one of these back of the seat organizers for our car a while ago...and never got around to doing it! Jellybean Junkyard created one to keep things in order in the car. Her's is marvelous! Not only does it organize, but it keeps the kids from wiping their dirty feet all over the seats!!!! I love how the books, toys and drink are all within the reach of the child!
See the back seat organizer tutorial.