ok can confirm that the 4gb cards I bought

http://www.mobymemory.com/proddetail...Y%5F4096%5F001

work perfectly. filled them up with various audio, video, jpgs, pdfs and text data and everything is good, can move from card to card in 800, everything opens, plays, the lot.

one quick tip - the internal card only gets recognized when you put the back cover back on!