i get documents all the time that are laid out for A4 paper. when i go to print them, my printer asks me to load A4 paper ... well, i don't have the a4 paper cartridge for it so i can't do anything but cancel the print job.
if it's an odf doc then no problem: just reset the page size. but what if it is a pdf? no problem, kword opens up pdf's well enough and then i can resize the page there.
however, i'm really interested after reading albert's blogs on printing in kpdf and a nice new pdftk frontend. hopefully there'll be a way in okular or this new pdftk thing to switch between paper sizes.
or i could just buy an a4 printer or move to europe and not deal with the inconsistencies anymore ;)