[tyleregeto]

Code: The Hidden Language of Computer Hardware and Software http://www.amazon.ca/gp/aw/d/B008PGKDOO This is one of the most enjoyable reads I have had in a long time, definitely recommended.

Introduction to Information Retrieval http://nlp.stanford.edu/IR-book/ This is a free digital book, very good so far.

[blinkingled]

I will second the recommendation for CODE. Great book - you can even read that with your kids.

[drtse4]

Code, highly recommended, even if the content isn't new for you, it's so neatly structured that you'll enjoy reading it anyway.