Raptors - I have a 2GB SD card installed. I have OS4.5 and am copying, via file manager, files I want to have quick access to on my BB. I've read that with OS4.5 you can run a DocstoGo viewer and view MS office files from the card. I"m working that right now.
In short. Copy your files to your SD card using your computer. Unfortuantely, you'll have to delete them out of email to make room on your built in memory.