AFAIK the new firmware is not out yet, it's factory firmware only. It will take a 2GB SD card and an 8GB MS, but there is no point. I have both, but there are no library functions available so if you have more than a couple of hundred books you'll spend a lot of time looking for things. Ditto with music except that you can't even jump to artists beginning with a letter, you just get 100+ pages of songs. Want page 75 in the song listing? Hit the "next page" key 75 times.
There's a dictionary available in
this thread
PDFs I dunno, you could try the search functions on this forum.