If you can afford it, the iRex iliad Book Edition has a larger screen that the other EInk devices mentioned here. The larger screen allows a larger font. For screenshots, see
Things you can do with your iLiad. For actual size iLiad screenshots (bitmaps of the screen) print them on paper at 4.7" by 6.2". Note that the size of text in menus may also be an issue. The screenshots include one for the "content lister" (library) on the iLiad. I have not used a Cybook, but is has a 5 per page library view that looks pretty good, see the last photo in
I promised some pictures....