Some people also asked why there is no cd with their reader and where the sony software is. Of course most have no time to wonder, once you plug in the reader it installs itself, buy it still may be a good idea pointing out that the software (and the manual) are on the reader itself (for the prs-600 at least)
Another popular question is how to stop the software opening every time you plug in your reader.
And maybe a "how to get books on your reader" guide. Using sony software, using calibre, using ADE, dragging and dropping....