I just read three stories straight about children being left in cars. I think most of us know not to leave our kid in the car - even to run into the store. Always pay at the pump at a gas station, or take your kid in with you!
But I also read a story about a woman who forgot that her baby was in the car. So I thought I'd share this good idea:
If you're constantly commuting to work/school/daycare, it can be easy to forget for a moment that you've still got your kid in the car with you. So whenever you commute, put your school or diaper bag in the backseat with your kid. That way, if you spaced out and drove straight to work, you'd realize that the kid was still there.
Another idea I've heard of is putting a stuffed animal in the carseat whenever it's empty, and putting it on your front seat when your kid's in the car.
I know this is one of those things that has very little chance of ever happening...but the idea about putting the bag in the backseat is really very little effort.