Great article on links. Things to look for: site-performance, relevancy, age of link, age of site and context of link.
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Going on an inbound link crusade is a great idea, but before you go crazy finding as many links as
possible, remember quality counts. Inbound, relevant links on quality sites are better than many general, low quality links and will have a better impact on your organic search rankings, which will ultimately drive traffic to your website.