If you select "My Files" view in the library on your simple touch, it brings up a folder level view of main memory or your SD card. Navigate from there just like you would viewing the folders on your computer.
For shelves, you will be dissapointed, because if you reboot your nook ST (and some report simply connecting to a computer) will wipe any books stored on your SD card off of the shelves they were loaded in to. The shelves will still be there and the books are still on the SD card, but they'll be lost from the shelf (and issue I hope BN is working on fixing!)
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