I wonder when Eliana will be old enough for this

I have seen this idea on Martha Stewart before, but thanks to our recent road trip have had renewed interest in it. I wonder when Eliana will be old enough for something like this? I'm guessing it will be sooner rather than later, I just have to put some thought and work into it. It would be nice to have some special activity bucket that's just for longer trips in the car. Currently our source of travel entertainment for her is the DVD player, and I think she could use some variety other than Blue's Clues, Veggie Tales, and the BBC Planet Earth series.

Reward System

Ellie is not old enough for a reward system yet, at least not one as complicated as this one. But this is the first reward system that I have really really liked, so I want to remember it. It's basically a point system, and the points are earned each day for doing various things. Points are set for each task (like brushing teeth, getting dressed by self, doing chores, etc.) and they can be redeemed for different things, from a cup of juice or chocolate milk, to an extra 15 minutes at bedtime, to a tv show, or whatever the parent sets. Not only do I like the idea behind this particular reward system, but I really like the cute way this mom implemented it. When Ellie is old enough, I'd like to do this, too.