From Link Building Guide

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Key Metrics for Analyzing the Link Value of URLs

When performing link building research, specifically to determine the value of a link (as opposed to relevance), the important thing to look for are URLs that have the qualities and qualifications of a rank-influencing link.

Some of the qualifiers and metrics readily available tools enable you to analyze are:

• Primary Metrics:
  • PageRank
  • Total Backlinks in Google and Yahoo!
  • If the URL is in DMOZ
  • Co-Citation Analysis

• Secondary Metrics:
  • Domain Age
  • Alexa Ranking
  • Delicious Submissions
  • EDU Links
  • GOV Links
  • Wikipedia Links
  • Yahoo! Directory Links

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