Anything available with no DRM should be easy to process to meet your friend's needs. I'd bet that one of the volunteers providing eBook conversion software would be willing to cons up a switch that would put output into a narrow format. With that done, he'd be able to use any convertable format. SF & Fantasy from Baen. Older books from Project Gutenberg. News feeds and RSS off the web in general.
If the reader's screen seems good enough except for width, you should venture over to the Reader Developer's Corner and ask the folks there to support "narrow column" mode.
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