Directory Structure Standards

[Its due when]

Hi All, Im trying to come up with a definitive listing of why a good directory structure is important in web development. Are there any good articles, posts, standards out there that reflect this. Your thoughts on the matter would also be greatly appreciated. Apart from site remodelling and future expansion can anyone suggest other imperative reasons for ensuring that directory structure conform to some sort of standard. Thanking you in advance. "Im cold and there are wolves after me"