Just My Type
Santa was good to me this year, and brought me a copy of Just My Type: A Book About Fonts, by Simon Garfield.
If you've ever had a copy of the Letraset Catalogue on your shelf, or know what (rather than who) Arnold Böcklin is and can recognise it in the street, you'd enjoy reading this. If you can instantly tell Helvetica and Arial based only on their respective lower-case 'a's, it might be a bit simplistic for you.
A word to the wise: skip the chapter on Eric Gill's personal habits. No Wikipedia link for that one.