A box of wooden matches wrapped in plastic and taped, to be completely waterproof up until the moment you have to cut it open. A tiny birthday candle, a finger-long piece of ordinary candle (also for light) and a chunk of paraffin-soaked firestarter. This should be enough for me to light a fire in most circumstances.
An ordinary butane lighter is handy for lighting the stove and burning used toilet paper, as well as for lighting fires.
Comments and current insights: For daily fire chores on the trail I nowadays use a lighter. It is waterproof and can hold a flame for a longer period of time than a match - something that can be quite important when trying to ignite damp kindling. The biggest disadvantage is that the flame is so easily exstinguished by even a slight breeze. If you are using a canister stove and need a wood fire for warmth or pleasure, do not forget that the stove is a powerful blowtorch that will help you set fire to even wet kindling and damp branches.