Over on the Ameraucana thread, Mahonri has made mention of getting his(?) cockerel decrowed although I don't know if he has actually had it done or has any experience with it. It was the first I had heard of such a procedure, and there isn't any information specific to the procedure on that thread. But maybe if you PM'd him he could share the information with you. I do know that he had to get rid of a lot of his chickens, and for a while was in danger of having to get rid of all of them, because his neighbors complained about the roosters crowing. He lives in AZ, so I don't know if he could point you to any vets though.
As for everyone who states that birds always do poorly under anesthesia, etc...that depends entirely on the skill and experience level of the tech monitoring the anesthesia and the doctor doing the surgery (and to some extent what the surgery is). Having worked for a board certified avian vet and monitored many surgical procedures on birds that were much longer and more complicated than a decrowing surgery probably would be I do not believe that anesthesia for birds is necessarily any more dangerous than for cats, dogs, or other pets. Yes, with someone who doesn't know what they are doing there is a big risk. But birds do remarkably well with anesthesia for all the horror stories out there. All of the birds I have lost under anesthesia have been under for very difficult surgeries, usually to try to correct a condition that would be fatal without surgery anyway. For many birds we actually used anesthesia for routine x-rays because the risk of the bird hurting themselves while fighting us for the x-rays was greater than risk of the anesthesia.
