Is there any software that will span a folder tree onto multiple optical discs from the Mac so that the folder tree can be later reassembled on Windows?
Try Toast 7 titanium, it does support disc spanning and you can choose if your DVD is readable on Mac and PCs (if the combination of the two works - I don´t know).
I use MacHacha(free) to split .dmg images into multiple files that can be burned separatly. You can either make an image or a zip file and use machacha to split it. MacHacha can make a windows .exe file to reassamble the pieces
Try Toast 7 titanium, it does support disc spanning and you can choose if your DVD is readable on Mac and PCs (if the combination of the two works - I don´t know).