I have tried using the full version of Acrobat (v5). The only thing that I have been able to do is to number the thumbnails. I need the numbers to show up on the document when printed, and I haven't been able to find a way to do this using Acrobat.
Thanks for the info on PDFpen. I am looking into the program to see if it will be able to do this easliy. I know that it is possible to manually place the numbers on the pages using Acrobat, Illustrator, and possibly PDFpen, but this is going to be a published document, so I would like the numbers to be in the same place. This would all but eliminate manual insertion and the "low tech" solution offered by wordmunger (it is a digital submission).
Thanks for all the suggestions, any others would be appreciated.
-Hobbes
edit: It looks like PDFpen has done the trick. Thanks for everyone's help.