For a limited time (I’m not sure how limited) you can get eOffice for BlackBerry for $69.95, or upgrade to Native 4.3 for only $19.95.
-Document Authoring & Attachment Editing
-PDF, PowerPoint®, DOC, XLS, Faxes and Images
-Desktop File Access
-Local Storage Document Push, Printing and Faxing
There is also MasterDoc which is $49.95, but this one is more limited than eOffice.