One of the ways we ve found to strengthen our presence on the Internet is to use Link Vault.
Link Vault is a site where you can register you and enlist your websites, just to share a space where you place links on other sites. Link Vault do it automatically for you.
Once you ve configured your site to get links and is approved, you can configure the links you need using keywords or phrases to increase your PR and also improve the ranking of your pages.
Give a visit to Link Vault is free, also has a section when you want to pay to generate many links to your site.