RepliGo Reader, which allows you to view native PDF files stored on the microSD card, is also in beta:
"RepliGo Reader is a full-featured Adobe® PDF viewer, similar to Adobe® Reader for your desktop. You can quickly zoom in and out of documents to inspect the details of any page. RepliGo Reader can also intelligently reformat pages to fit the width of your BlackBerry screen, making it easy to read documents by eliminating horizontal scrolling.
RepliGo Reader is compatible only with BlackBerry 8100 Series, BlackBerry 8300, BlackBerry 8700, and BlackBerry 8800 Series.
RepliGo Reader is currently under development and a beta program will begin in June 08. Pricing has not yet been determined."