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If anyone has the opportunity to take an ECA (Emergency Care Attendant) class, take it It may be called a first responders course too. It is a very good overall advanced first aid class. You should be able to track one down through the local EMS services.
I sometimes serve in a volunteer capacity as a 3rd on ambulance with this.
As to kits and contents, http://www.mobil-medic.com/ has some good stuff. A kit called a 'cab kit' should get you started.
Other good sources: http://www.thefirestore.com/