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I've used a 4GB card for a while until I found out that page turns from external memory are much slower than from the readers memory. After that, I used the SD-Card to have other books/pdfs available all the time. But, actually, I have a couple of pdfs on my reader and once a file is read, I delete it right from the reader. By the time I'm finished with the "pile" of books, I've accumulated new ones on the pc and then I just move them to the reader. BTW, page turn times on the 505 were 50% faster from the readers memory for pdfs. I didn't check this for the 600, but by personal perception I would say it was about the same.
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