Boomerang

Boomerang Fun
Explains aerodynamics, types, games, history, and related links.
http://www.boomerangfun.com/

Boomerang Passion
Includes design plans with descriptions and pictures, decoration ideas, FAQ, photos, and related links.
http://www.boomerangpassion.com/english.php

Digital Boomerang Systems
Offers photos of original boomerang designs, and the basics of catch and throw.
http://www.boomsmith.com/

Gel Boomerangs
Tuning and throwing instructions, tips on corrective measures for accuracy problems, and an explanation of events from this retired manufacturer.
http://www.gel-boomerang.com/

History of Boomerangs
A brief summary of the evolution of the sport.
http://www.rediboom.com/englisch/geschich/

Long Distance Boomerangs
News, bulletin board, tournament results, and instructions; dedicated exclusively to long-distance throwing.
http://www.baggressive.com/

MX Boomerangs
Provides instructions on throwing, types and how they are made, and information on subscribing to the rang email list.
http://www.boomerangs.org/