Sometimes people forget that greyhounds need homes once they are unable to race anymore... these lovely dogs make wonderful pets. I was surprised how gentle and placid they can be considering they are bred for speed.
I have had many students who are involved in this worthwhile cause of rehoming greyhounds. I found this blog about it, and you can also see more in New Zealand at http://www.greyhoundsaspets.org.nz/
For those living overseas, just search for "Greyhounds as Pets" and your own local organisations will show up. Most of them run get togethers where you can meet available dogs, get together regularly at local parks to show off your dogs and meet other potential adopters.
If you are interested, do get in touch with them and find out if you are a suitable owner... they will be more than happy tell you what is required :)