For personal interest more than anything else, I've started correcting one of my school books (it's full of math errors and illustrations are often placed in bizarre places, like several pages after where they're referenced in the text). While I'm at it, I thought I'd give it a typographic makeover too. Here's the first chapter that I reworked. The original is all black and white with line-art illustrations.
I would appreciate any criticisms you have about it. Areas I'm particularly not sure about are the use of old-style numbers in some places and lining numbers in others, the use of Caslon for the opening text and then switching to Warnock for the main text (I did this thinking to set opening quotes in a font that relates to the chapter, so since these quotes are more 18th and 19th century in nature, I though Caslon would be good. A chapter on GPS, for instance, might get a background picture of the Earth with a very modern font on top in white, or something like that.), the use of brown-on-light brown for the first page, and the use of Caslon for the chapter thumb markers (where each chapter's thumb marker would use the same general background/font as the first spread of the chapter).
Let me know what you think.