Wow you guys are truly geeks...

(And I am totally joking with that comment) Reminds me of some of the speeches of Bill Clinton. I knew the words he was using but I just couldnt figure out what he was talking about!
Natch thanks for the answer. Now I know I dont have to go buy a card reader. I already bought one of those M Edge cases for my reader i dont even have yet.
I'm probably going to put hundreds of books on the reader. I LOVE the idea of lugging hundreds if not thousands of books around with me to read at my leisure. I tend to be a bit eclectic about my reading choices depending on mood and setting and would love to have the diversity of choice 300 or more books offers. From Robert frosts Poems If I'm looking at a sunset to Patrick McManus hilarious outdoor hyperbole if I only have a few minutes waiting in line somewhere.
I was at WalMart just today with my wife... "Oh Honey! I wanna just buy Mom a card for mothers day!" So I grabbed a card after looking for a total of 55 seconds, she's looking, I'm waiting. Finally I say, "I'm gonna go sit on the patio furniture and wait for you." About 25 minutes later she finally selects her card and is ready to go. Meanwhile I sat there watching people walk by with NO BOOK TO READ! I wish I would have had my reader with me. It would have been a perfect place to drift off to Pern for a few minutes.
Or read a couple of chapters of Isaiah!
I dont think I will mind scrolling through tons of file names to find the book I wanna read as long as it only takes a second to go to the next page of files.
Flat file system?
How is it even possible that the good folks at Sony did not design this thing with subfolder capabilites? Its hard to believe...
I have an excellent MP3 player, The gigabeat so i dont think I'll use the mp3 application at all...
I guess I'll just have to put up with the file system.