try to get high PR Back link as Google give more importance to high pr sites. There are a lot of way to get BL as Link Exchange, Articles, social bookmarking and much more techniques you can use.
IF your site contains 3 PR than you have to put your link in those sites which have more than 3 PR, This is the best way to increase your PR.
PR is only from links, for specific, only good links, and only google know what is good links for you.
I would probably recommend submitting articles to top article sites, blog commenting, social networking and social bookmarking to be the best ways.
The best strategy of increasing your PR is to build backlinks from high PR websites. But how to build quality backlinks? (DoFollow) Blog commenting Article submission services, such as EZA, GoArticles Forum marketing (DoFollow) Social bookmarking sites ......
Directory submission, article submission and blog commenting are the most commonly used methods... but I agree that the free links often land up on a PR0 page and so... unfortunately, buying is the only valid and quick option! Regards, RightMan
Rightman is right on! It's very difficult to get a high PR link. If you can find some blogs that are PR4+, your comment only shows on the permalink page, which might be a PR3, at best. That's not too bad, but you will need hundreds and maybe thousands of those to really make a difference. If you really want high PR links, you need to hang out with people that know how to find them. Maybe some sort of private club or organization. (hint). Bompa