Since finishing my adventures in Cocoa... I've taken on another technical book:
Programming Collective Intelligence by Toby Segaran
It's a book about data and intelligence. I wish I could describe it better, but it's seriously a book that describes very interesting and intelligence ways to think about data. It gives you tools that larger companies use every day to make your experience on the web better. Google PageRank, Amazon Product suggestions, last.fm music recommendations, etc. It covers everything from suggestion engines, decision trees, and even touches on genetic programming (one of my favorite topics).
Great book so far... it's written in Python, but I'm actively porting it to Ruby while I read it No point in porting it to Ruby, lot's of people are doing it, and with soo many errors in the Python code, it'll be no use for now...