Another Humble Bundle, so I'll keep this short:
Humble Book Bundle - The Joy of Coding
A bundle of joy. For programmers who love what they do, diving into a new language is an exciting and rewarding challenge. Whether you’re looking to add some new skills to your resume or just searching for fun weekend projects, the Joy of Coding bundle is full of possibility. Explore the power and versatility of Python, Lisp, Haskell, Erlang, Clojure, and more with this collection of best-selling programming books.
Pay $1 or more for Automate the Boring Stuff with Python, The Linux Command Line, Learn You a Haskell for Great Good!, Learn You Some Erlang for Great Good!, and The Book of F#.
Pay $15 or more to receive all of that plus Python Playground, Think Like a Programmer, The Art of R Programming, Clojure for the Brave and True, and Write Great Code, Volume 2.