I have 3 retiring racing greyhounds, and I love learning more about the breed on the internet. I've got alot of websites bookmarked on my computer at home, so I'll send you some of those later!
They are wonderful dogs, but the first thing we always tell interested adopters is that they can never be let off-leash (they are very fast and they love to sprint). If you don't have a fenced-in backyard, you have to walk them on leash every time they have to go potty or they need exercise. You may think this wouldn't be hard, but if the dog has diarhea and has to go outside every hour, all night, you may think differently. Ask Staci, "Shai's Mom," about not having a fenced-in yard!
I could tell you a million things about them, but I'd recommend reading "Adopting the Retired Racing Greyhound" by Cynthia Brannigan.