I have had inconsistent results with dryer lint; I've experience it lighting extremely easily, but I've also had some that just didn't want to light.

I think its effectiveness is dependant on the materials which were being dried before it was collected. I guess if I were to put some aside for a fire starting kit, I'd want to test the batch it came from to make sure it was the super flammable type.

That said, I've started using cotton balls when camping with good results; they are now my preferred method for fire starting. The only other type I carry right now are the Tinder Quicks that came with the Ritter PSP.