Quality inbound links are an essential element of web site marketing and search engine optimization programs to increase traffic and online sales. The greater the number of relevant and authoritative links to a web page, the greater the potential for higher search engine rankings and qualified traffic.
http://www.toprankblog.com/2009/11/1-seo-tools-for-tracking-inbound-links/
Diversifying your SEO is vital considering the possibility that your main site could be banned in major search engines like Google. An SEO Monopoly can help you form multiple sites in your niche that attract your potential customers.