Thanks to everyone responding to this thread.
Simon- what flavor of Apple Pro Res did you use for your workflow? I have tried a number of the settings in Compressor and am still getting a 4×3 image in iDVD. (However it is showing at 857×480 in Quicktime)
I am running FCP 7, compressor 3.5.3 and Snow Leopard.
Thanks for any help you can lend.
Matt