X-link to the DRM-free thread for the new Humble Bundle:
Humble Book Bundle The Joy of Coding presented by No Starch Press contains programming books which cover both common and obscure languages, as well as best practices/coding philosophy and some computer programmer humour. Haskell, Erlang, F#, Lisp, Racket, Clojure, and R are among the languages which have introductory titles, with the Lisp and Racket books being kid-friendly as well.