If you want to improve your coding style, I have got a little gem of a book for you! I discovered it thanks to Stéphane Ducasse and his great collection of free Smalltalk books. It was written 10 years ago by Edward Kilmas, Suzanne Skublics and David A. Thomas (yes, Pragmatic Dave, from Pragmatic Programmer and Pickaxe fame) and it deals with writing Smalltalk with style.
It is aptly titled Smalltalk with Style.
The Smalltalk focus might not be of interest to you — although a bit of Smalltalk cannot hurt a serious programmer! — but the style guidelines are invaluable and can be easily adapted to other languages or incorporated into a coding standard.