@admins: Can we move this thread to the e-books forum?
When using the Adobe Acrobat Viewer for PPC, the PDFs are usually reflowed when transferred to the Axim through ActiveSynch so that you can read them without having to scroll sideways every single line. However, my experiences with this reflowing for complex PDF documents (such as text books) were not that great. In most cases, the docs could not be reflowed at all and the original PDFs were hardly viewable on the Axim.
Note that Adobe also offers online forms for converting PDF to HTML which is generally much easier to view on the Axims. I don't know how this conversion handles complex PDFs with lots of graphics, but it might be worth a try. See
http://access.adobe.com:8088/ads-cgi/convert.pl for details.