Both Keena and Rage donated back in July, I took them in because we had an emergency splenectomy who had been bleeding into her abdomen for a while, and Doc wanted fresh whole blood for her. Totally worth it in our case, dog was awesome, family was awesome, she made it through... my girls did great, didn't even sedate Keena. I don't know how you'd go about finding a place that would be collecting/storing/freezing, etc and doesn't already do the greyhound-thing? But yea, I found it very rewarding, but that's mostly because I saw the dog they donated to, so I was very close to the situation/could see how much they'd helped that family.