According to Google, about half the 2.5 billion searches done a day at Google are for unique, one-off phrases. The more pages you build full of on-topic material, the better the chances your site will be found.
When it comes to keywords, think big. You want your site to be found via THOUSANDS of different phrases every month. Then you can lure that traffic to your best money-generating pages or to your newsletter sign-up page. Also, search engines prefer fresh sites which keep gradually adding new
content. Don't let your site go stale.
Super affiliate James Martell says:
"My own rule of thumb is this: Add a minimum of 1 article per week, 2 preferably. Adding an article daily is euphoria and adding 1 every six hours, well, that's the best."
Source: Posted By mahbub-web on DIU Forum on 17 May, 2012