Yes. You can read PDFs on the 9800 as delivered. Sometimes it takes a while to load an image large enough to read though. You click the trackball and the image grows larger and gets fuzzy, it will eventually focus and become legible. This seems to be an email issue.
__________________
"You. My room. 10:30 tonight. You. 10:45... And bring a friend."
Documents To Go (Premium) is a suite of apps for opening .doc, .pdf, .xls, etc files. The email program will allow you to view most files you get as attachments but you won't be able to view them outside of the email to which they're attached, and you won't be able to edit them.