Suggestions gratefully accepted

Recently, I decided that I ought to carry an emergency kit in my car. (trash bag full of goodwill donations does not count) It seems to be one of those simple suggestions I fully intend to implement...and never do anything about. So, I decided to make 2011 the year this changes. I've done some research about basic necessities to have on hand, but I thought I'd reach out to the blog world. Do you have a car kit? If so, what did you include? Anything you don't have you wish you did? I don't plan on spending a lot of money to get started but I can certainly add to it over the next few months. (and that fleece sweatshirt I planned to get rid of just might come in handy in my little endeavor!)