How can I keep my iPhone / iPods cooler in a hot vehicle? Sometimes I have to leave my phone in a hot car and don't have any other options other than leaving it in a locked car in the summer heat. What are ways to keep the phone cooler and not overheat it or worse cause damage to the batteries, etc.

The other day I got a overheat warning on my iPhone after having to leave it in the car. What are some ways to prevent this?
Place the electronics that contain a lithium based battery in the shade and keep windows open a crack. If possible, place the vehicle in the shade or use light or reflective colored windshield shades to reduce the heat that stays in the car.

Usually the trunk (or a well insulated bag) will lag the passenger compartment many tens of degrees and warm up several hours slower than something in the main cabin.