this book: the non-designer's design book by robin williams.
this is on my list of best books about particular topics. this one is about design in general. i still remember the acronym the author came up with after all these years. parc for: proximity, alignment, r..., contrast. okay i lied, i don't remember what r stands for anymore haha :)
everything you see and like about good design have to do with these 4 terms. the web is no different.