I am reading Programming Ruby (2nd edition): The Pragmatic Programmers' Guide. Hey, I'm a computer programmer, so this stuff is fascinating to me. It would put most people to sleep. Prior to that, it was the Diary of St. Faustina and the books of Ezekiel, Isaiah, and Daniel from the Navarre Bible Study books with notations from many Early Church Fathers and St. Jose Maria Escriva.
Whoops, I misspoke! I actually used that Ruby programming guide at work today. I'm currently reading Programming Ruby 1.9 & 2.0 (4th edition): The Pragmatic Programmers' Guide.