Domain Authority (DA) was the much talked about metric of 2009. Post Vince-update, everyone has been trying to conceptualise and measure what "domain authority" really is and what it means to your rankings.
SEO Moz have done a pretty good job of merging trust (TrustRank/Moz Trust) and popularity (PageRank/MozRank) to create it's own 100 point scale domain authority (DM). DM has the strongest correlation of any link metric with the SERPs beating out yahoo links, unique linking domains and Google own PageRank.
Here's a video of how it's worked out.
http://www.seomoz.org/blog/whiteboard-friday-domain-authority-page-authority-metrics
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SEO India