Dryer lint can work well, depending on what fabric it was made from, how that fabric was originally treated, and what soaps and fabric softeners were used.
Here is an ordered listing and discussion of how well different substances burn for survival use, including dryer lint (though I need to update this list, and make some changes, since I am now a much more competent fire starter):
http://www.swampratknifeworks.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=11;t=000069
I think that a piece of pitchwood is the best choice for emergency fire-starting tinder, now that I have become skilled in the technique of lighting it from a spark. It burns hotter and longer than dryer lint, and, unlike dryer lint, is waterproof. You also don't need to worry about keeping it in sealed, airtight packaging, like many of the other best firestarters. And it is fairly easy to find in Northern woods, in a pinch.
Trioxane is the easiest to light, and highest heat output, survival kit item I know of. Unfortunately, it's toxic, and it can evaporate completely (over a several week to several month period) upon exposure to air.
Rubber cement lights next most easily, and burns hot, for a long time. However, it can leak and/or evaporate, leaving you with no tinder, while messing up your surrounding gear.
By the way, I agree strongly with grommit, that you need to practice until skilled and knowledgeable, instead of only finding out how lint compares from the internet, then sticking it in a kit until you need it.
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P.S. mistakaroo: You wouldn't happen to have had hobbies in tie-dying or batiquing, did you?
--Mike