How do you best organize your car?

I suggest keeping a container of some sort (i.e. plastic crate) in the trunk that contains emergency items. I suggest keeping another container in the trunk that contains car cleaning and/or maintenance items. In the cabin itself, keep the essentials (umbrella, car manuals, notepad and pen, etc.) in the glove compartment. Keep your sunglasses and CD's in one of the cubbies by the driver's seat.