Marketing and Content go hand-in-hand with each other.. You need to have some content on your website to do good marketing.
Unique content is import, then after next process is marketing like promotions. In this first process is content making, that's why still content is king.
I would like to move with "content is the king"... Search Engine gives lot of importance to fresh and optimized content..... view an article on content copy writing http://www.promotingwebs.com/articles/content-copywriting-tips.shtml