Directories would be of great help in building quality back links, thanks for the provided link.
the key of get high pr is:
1.backlink with high pr website.
2.backlink with relevant content website.
To increase the website page rank.You need to do free and paid seo methods.
You can do free directory submissions and article submissions to get small amount of traffic.If you need massive website traffic,you can get search engine visibility service from here Tucktail.com at low cost.It promote your site in many ways increase massive traffic and Google page rank very soon.
SEO techniques to get higher PR are Link exchange and guest posting but ensure that you get quality back-links.
First focus on the content of threads + backlinks ( white seo ) + patience
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