I have to confess that I just know how to see final score from $1.67 Billion-worth  algorithm called PageRank. The method is very easy because it uses only Google Toolbar but I still prefer web-based report for convenience.
After calculating more than 100 factors , PageRank summarize its score to simple 0-10 score level. If your site got 10, that means its score is even higher than Slashdot...!!!
This is my personal test with my favourite day-to-day sites: