Hi. Reading this, I thought I'd post my experience.
I talked to USAirways today about this topic, and here is what I was told: they understand if someone needs to take medication that requires injection, and that people wouldn't want to put that in a checkedd suitcase because of the obvious concern about theft. Therefore, they will allow people to bring injectible supplies as long as either (a) you have a copy of the prescription or (b) you have a note from your doctor or (c) the package is clearly labeled with a label affixed to it by a drugstore or mail-order supplier. They MAY ask you to give the sharps to a flight attendant for securing during flight, but they will write you out a receipt and give it to you on arrival. Seems fair enough to me.
I also asked about all the talk about banning carry-on luggage; I'm told nobody is doing that in reality, because of these concerns.
By the way, I take growth hormone, and I use insuline syringes because of the type of injection, so I understand the concern.
As a suggestion it is a good idea even when traveling by car to have a letter from your doctor with you -- I was once asked by a police officer about it when I was bringing them home from my doctor's office, and he was concerned I was carrying something illegal -- one look at the letter from my doctor, and it was, "Alright, everything seems to be in order here. Drive safelty."
Hope this all helps!
Regards,
Joe Hurley
who will probaby be cancelling his trip to wDW in November due to new job. :-|