I was in a serious Forth mode in college (even wrote my own Forth-like language, just because, and even used it for a class project) and because of that, I came

I was in a serious Forth mode in college (even wrote my own Forth-like language, just because, and even used it for a class project) and because of that, I came across _Thinking Forth_ (http://www.forthfreak.net/thinking-forth.pdf‎ http://www.forthfreak.net/thinking-forth.pdf‎ PDF FILE) which ended up being one of only two books that seriously changed how I approach programming. Even if you never program in Forth, _Thinking Forth_ is worth reading.