Some of the stuff I have in my car aside the standard toolkit are:

- jumper cables
- tow cable
- car rags
- two collapsible road cones (in place of warning triangles)
- one roll of duct tape
- flashlight (with fresh batteries)
- pocket knife (swiss army knife covers most of the "etc" tools)
- mobile phone car charger with USB port
- umbrellas
- a couple of raincoats (poncho style) in bright yellow color