From the faq on the website:
1. How do I interpret a journal's Eigenfactor score?
A journal's Eigenfactor score is our measure of the journal's total importance to the scientific community. With all else equal, a journal's Eigenfactor score doubles when it doubles in size. Thus a very large journal such as the Journal of Biological Chemistry which publishes more than 6,000 articles annually, will have extremely high Eigenfactor scores simply based upon its size.
2. How do I interpret a journal's Article Influence score?
A journal's Article Influence score is a measure of the average influence of each of its articles over the first five years after publication. Article Influence score measures the average influence, per article, of the papers in a journal. As such, it is comparable to Thomson Scientific's widely-used Impact Factor. Article Influence scores are normalized so that the mean article in the entire Thomson Journal Citation Reports (JCR) database has an article influence of 1.00. In 2006, the top journal by Article Influence score is Annual Reviews of Immunology, with an article influence of 27.454. This means that the average article in that journal has twenty seven times the influence of the mean journal in the JCR......
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