web standards - why using css

Lot of people keep asking - why shall we use css - why shall I go through all this hassle - It takes me so much time to develop a design using CSS, why couldn't I use tables for my layout instead? what is xhtml? etc .. etc ...

Found a very good articles about the subject.
http://www.456bereastreet.com/lab/developing_with_web_standards/full/

=> Gives you the best overview I have ever read on the topic

http://www.456bereastreet.com/lab/developing_with_web_standards/csslayout/2-col/
=> I have been struggling teaching CSS in a few hours to my clients, to let them use efficiently and effectively our content management platform. This article is perfect, and I think I'll be using it for my introduction to CSS from now on!