Hmm, I have a softmodded Xbox and two HD's. One is softmodded- the other is not. I have successfully mad e a paintjob on my softmodded HD that I would like to transfer somehow to my stock HD. Is there a way to do so? I want to use the paintjob on Xbox Live. Can I re-softmod my stock HD and FTP the paintjobs from my computer to my Xbox? Any help would be greatly appreciated.

ForzaSign does exactly what you are looking to do:
http://forzacustoms.info/

Just FTP the profile with the paintjobs you want to move off your xbox, get the HDDKeys of your original xbox and the destination xboxes, resign the profile with forzasign, and transfer the profile to the Forza UDATA folder on the destination xbox.

Program looks great! Just one question. When you say copy your profile over from the Xbox HD to your PC, do you mean the entire profile. Like the one with the livery folder and everything inside? Thanks for your help.

Ah, another problem. Somehow my source HD and my destination HD have the same XboxHD key. I am looking at the right key right? 16 sets of 2 digits or letters?

They can't have the same key.

No, they did have the same key. Turns out I didn't even need the program. Must have been the way I formatted my new HD through XboxHDM.