Dansk Boomerang Klub:
www.geocities.com/DanskBoomerangKlub

Deutcher Bumerang Club
www.bumerangclub.de/

British Boomerang Society:
www.lazo.freeserve.co.uk

How to make boomerangs:
www.uku.fi/~hniskane/workmain.html

Boomerang links fra hele verden:
www.flight-toys.com/boomerangs.htm

Unspinning the Boomerang
plus.maths.org/issue7/features/boomerangs/