A brilliant MIT professor's reflections on the intersection between computer science, physics and philosophy.
Here are the lecture notes and book: http://www.scottaaronson.com/democritus/
I also very much recommend the author's blog: http://www.scottaaronson.com/blog/
"It's a shame that, after proving his Completeness Theorem, Gödel never really did anything else of note. [Pause for comic effect] "
Similarly to books like GEB, it really exposed me to a whole range of fascinating ideas and topics that I am now interested in.