Australian and New Guinea Freshwater Fishes
A large site on fish from these regions including many rainbowfishes.
History of the Rainbowfishes
http://pandora.nla.gov.au/nph-arch/1999/Z1999-Mar-8/http://gallery.uunet.be/Stefan.Maebe/history.htm
The story of how many of these species were discovered by the western world and the aquarium hobby.
Rainbowfish OnLine Magazine
On line magazine dedicated to Rainbowfishes of Australia and New Guinea. Contains technical articles about rainbowfish and species found in association with them such as the killie gudgeon.