One of the best websites for new adopters:

Circle of Greys
Website for greyhound owners experiencing illness or cancer in their hound:

The Greyhound Health Initiative

Greyhound Data Base
Greyhound Data base that contains pedigrees, littermates and racing records of all NGA greyhounds:

Track Info
Track Info is a website that is the official source for races and videos of your greyhound’s races: