To improve your site's backlinks, you have to build links from sites that are related to your site's them and have great content and PR. Search engines give more value on the relevancy of the site.
Relevant inbound links or back links to a website act to improve your search engine results page rank. The key to successful use of back links is relevancy. In other words, in-bound links from a website need to be relevant to the content of your site. If your website is about pet care, for example, a back link from a dog holiday resort would be considered relevant while one from restaurant would not. Furthermore, the most valuable relevant links will be one-way, not reciprocal. Relevant linking also involves the rate at which links are created. Creating links too fast can trigger a negative search engine response. It is far better for search engine optimization to grow in a natural organic way. Successful search engine optimization requires that your inbound links be of high quality. For SEO purposes, quality is more important than quantity. Never use link exchanges or link farms to generate links. Not only are they not relevant, they can cause your site to incur severe penalties from the search engines. Their sole purpose is to deceive the search engines into believing you are building legitimate inbound links. However, newer algorithms can detect the fraud and you will incur a penalty. I hope this helps
a quality back link is a link to your site that has good pr and is relevant to your site with good anchor text
Write articles and submit them to article directories ( ezine.com ) This is a great way to get one-way links.
a incoming link from different relevant site which has a considerable number of visitor and a good pr is a quallity back link.
This is the perfect answer for Quality link Back, as we just be careful that our back link page has no more than 30 outbound links, and all links should be related to same theme. so we can have benefit of it.
Sorry, forgot to say in last reply, No more links from free directory submission, i think it's not more useful, as it was few years ago. as per latest SE Trend, Try to use Book Marking to get Free one way link. ----------------------------- Spread The Smile to World