Code Complete 2nd edition is a good and interesting book about programming in general. I also recommend these two because they are much lighter reads, and maybe better for a vacation: "The Passionate Programmer" and also "Masterminds of Programming: Conversations with the Creators of Major Programming Languages".

Another thing you could do is find some great piece of software by a well know Python hacker and read his code lol. You could put that code in some readable format on your Kindle, PDA, or Smartphone.