I did some changes and started to add articles and tutorials. Guess what: google sent 2,625 non-paid visits via 1,999 keywords This is for last month from today and back. Total traffic from search engines increased to 40% of total website traffic. So I think that every one who wants more traffic should create a unique content in order to increase your traffic. I won't list my site here, it has PR6 and Alexa 140K. If you optimize your site and add SEO friendly links than your traffic will increase. Also I can add this, the pages that came up in SERP top 10 they got PR too.
It is true.. having a unique content really helps in achieving high PR..thank you for this information..