The biggest advantage of using the (proprietary, otherwise crappy) memory stick is that the 505 can use an 8 GB memory stick but only a 2 GB SD card per the specs.
I have an 8GB stick in mine, though it's only loaded with around 200 MB of books so far.
Per other posters, it may not matter if the reader interface slows to a crawl before reaching 2GB anyways.
Diego
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