Fire is Important, this we all know, but check this latest discovery for an awesome tinder choice:

   

Its lint from the Tumble dryer.  Empty the catcher and hey presto, dry, ultra flammable tinder.  Drop a few sparks from a firesteel an away it goes.  This stuff really works!  Its not a natural material as such, but its worth it to always have a reliable tinder.  Check out the Gear section of the site for a more in-depth look at the firesteel and this awesome tinder...