And a follow up... might be just a temporary limitation for GetFLV, but it strongly urges you to use the Safari/iPad kernel for Vudu and then you can only get the flavors of SD or worse.
Using the IE kernel you can get as far as being asked which stream up to 9000k you want and where to save it, but then it does nothing with it.
Might be a temporary thing, might not be. I haven't tried TubeDigger on Vudu.