A while back I posted a few storyboards that were used in the Making of Batman Forever book by Michael Singer.
I've now found a few more - these were taken from a recording of a 15 minute HBO special behind the scenes segment that someone recorded off TV. As such they are quite low quality. Still I hope you get a kick out of seeing them and can guess where they were all from.
Once again, if anyone knows where I can get my hands on more. Let me know.