How Stuff Works: Boomerang
Illustrated tutorial explains the physics behind the propeller-like flight of the boomerang.
http://www.howstuffworks.com/boomerang.htm

Lesson with a Boomerang
This lesson plan uses the boomerang to demonstrate basic mathematical principles.
http://www.iit.edu/~smile/ma96m5.html

Boomerangs!
National Geographic's article with 2 videos of boomerang throwing.
http://www.nationalgeographic.com/world/0008/boomerang/index.html

Sports: The Boomerang Page
An article describing why a boomerang returns, based on the aerodynamics, the shape and the throwing technique.
http://wings.avkids.com/Book/Sports/instructor/boomerang-01.html

Minnesota Technolog: Boomeranging
An article on the sport and about Billy Brazelton, a junior in the College of Biological Sciences, who plays it.
http://technolog.it.umn.edu/technolog/fall00/boomeranging.html

Research Support Technologies: Aerodynamics of Boomerang
Provides articles summarizing the aerodynamics of boomerangs and explaining the principles to build construct your own.
http://www.researchsupporttechnologies.com/boomerang_site/boomerang1.htm