I recently put together a "travel" first aid kit. I found the Adventure Medical Kits site to be pretty useful. They have a wide variety of kits and the published inventory lists break the contents into categories. I used their categories as the base for packing and listing the contents of my kit.

My categories are:
-Bandage Material
-Blister/Burn
-Fracture/Sprain
-Wound Care
-Dental
-Medication
-Insturments
-Other

-J