[doomcashdown]

Just beware of linking to link farms for your site's safety.

[abrilward]

One of the important factors of getting high PR is the number of back links that you are getting. Just remember to get more back links on relevant and DoFollow sites because Google gives more value on those kinds of back links. Quality is better than quantity right?

[sudoku_gp]

I would say popular social bookmarking sites are very helpful. Of course SEO is the most important method to increase your traffic. Then social bookmarking will give you some traffic too.

[yohan]

Back link is the key! It is one of the factors that helps you get high PR. In order to get more back links, engaging on the following techniques helps:

blog commenting
article and directory submissions
classified ads
forum posting
link exchange (exchange links on relevant sites)
social bookmarking
press release

[Jenie0109]

Do some:
Directory Submission
Forum Posting
Blog Commenting
Blog Posting
Article Submission
Press Release Submission
Social Bookmarking.

[doomcashdown]

Consider also on-page optimization. Post unique and interesting topics, and always update your site. Optimize your keywords in the important elements. Put keywords in your title and meta tags, in headings, in emphasized (bold and italics) words, and in anchor texts.

[adamjhuathan]

Get more backlinks from your niche related sources. That will help you to get good PR.
Specially, your niche related forums postings, blog commentings and etc.
As well as Article submissions too do help.

[mammothwoolly]

Link building is an extremely important part of improving your Google search engine rankings as soon as possible. When other websites on the internet create links to your website, Google looks favorably upon your website and will rank you higher.

This is because you will be perceived to have a higher level of authority than before, if other websites on the internet are linking to you.

Participate in link exchange campaigns or find other ways to create links to your website from other places on the internet.

[Hafsoh]

One of the ways is to get links from related high PR sites with less outbound links.

[doomcashdown]

And try to make your link be placed in the homepage or in regular pages and not on the "Resources" page in order for your backlinks to have more weight.