There's a stimulus program that has been approved to hopefully get people to replace their old gas-guzzling vehicle with a new car. The program should begin the end of July.
Two big restrictions: Must be newer than 1984 and get less than or 18mpg combined. My car gets 20mpg, so it's not eligible. As it turns out, most older cars after 1984 get pretty decent gas millage, unless it's an SUV or large body vehicle like a van or light truck. Here's a list of eligible clunkers I found.
It sure would be nice to get $4500 towards a purchase of a new car. Maybe after the program fails to generate interest they will qualify more vehicles like my own.