The lack of syntax highlighting in books don't bother me too much, it's the size of the book. I've gotten used to a wide screen monitor for code so it's nice when that long if statement is on one line.

For the purpose of learning from a book the bold and italics in print is often good enough for me. Have def in bold and comments in italics and i'm generally pleased. Then again it could just me a bias I have since i prefer to reading books than pdfs on a computer.