Hey,
I just had to post a reply too.. we leave in 2 weeks and We will have a 4, 2, and a 1 year old riding...
Here's what I have in the "I'm bored" bucket. by the way my first advice is
DRIVE AT NIGHT *hee hee* by the way we have 20 hours to get there.
Wal-Mart sells a walk man for 4.95 so I have one each for my 4 and 2

(we let the kids listen to a book on tape and we get to talk in the front seat)
1 pkg of pipecleaners (kids are facinated with the fuzzy ones...)
Silly putty and a Sunday comics (cleaner than playdoh in my car!)
Lacing Fun Boards (homemade fun) (buy bright colored cardboard and cut into odd shapes, then use a handheld hole punch and punch holes around the edge with each hole being about an inch apart--use shoestrings or yarn with a taped end to "lace" or "sew". then you take the string back out and swap shapes...(they sell lacing sets at stores like Zany Brainy but homemade are just as fun and inexpensive) Shapes we use are circle, square, triangle, cross, heart, and mickey ears for this trip.
Pen light flashlights are fun at dark (as long as they don't bother the driver or figuire out they can morse code other passing cars* ha ha! (we keep one per child in our diaper/bottle bag and only let the kids play with them while we are waiting for food in restaurants--works wonders!!
We have one oversized (12x12) Bingo board with pictures of things they might see out the window.
We use Mickey Stickers to cover up what they spot until the whole board is covered.
Might be a good reason to stop for a treat when we finish off the board.
I had bought alot of the Disney party stuff on clearance at TRU a couple of weeks ago so we will open treat bags filled with goodies at certian mile markers.
My mind is going blank...
I just got the kids to bed and I'll have to run go see what else is in there...
Just a few ideas though,
Enjoy your trip! I know we will!!
Xhausted

inkbounc