Check your site’s strength at seomoz.org.
And how is the score calculated?
According to the website, the tool estimates using criteria from humans (del.icio.us tags, Alexa Rank, mentions at Wikipedia, etc.) and machine-assembled data (like pages indexed, internal link percent and even PageRank itself). It is by no means perfect or entirely accurate, but it is a significant upgrade from Google’s often inaccurate and infrequently updated PageRank score (and it’s fun to use).
And how does the GEO blog fare?