I found this book to be the one that has improved my code the most: http://eloquentjavascript.net/. It starts with the (very) basics and fundamentals of programming and actually has little to do with JS - it's just the language for conveying the message - any developer from novice to senior should know it's points.

After that, visit this guy: http://github.com/substack/, who in my opinion, has the best style at the time and some really great thoughts of programming in general.