Fighting Spam with CSS

Recently i had come across an interesting article which offered to prevent spam by using css styles and few lines of programming. This seems very simple and too good to be true. IF it works i think we can even think of avoiding captchas. Either way it offers a new insight to fighting spam. What do you say guys?
http://www.modernblue.com/web-design-bl ... -with-css/
http://www.modernblue.com/web-design-bl ... -with-css/