Gitishome(site info)
Includes artitcles, anecdotes, and contributions about the sport's aspects, FAQs on throws, tips on disc maintenance, terminology, and a database of teams around the United States.
http://www.gitishome.com
5.
Heinsville.com(site info)
Contains details and pictures illustrating how to do various levels of tricks, a listing of equipment necessary to jam, and a picture gallery. Also sells trick rings.
http://www.heinsville.com/