Google Page Rank

Google's PageRank (PR) has only ever been an approximation of the quality of a web page, and has never had anything to do with measuring its topical relevance: that's measured with link context and other on-page factors - such as keyword density, title tag, and lots of other algorithmic 'stuff'.

Websites are placed into deciles by Google - with scores ranging from zero to ten, and whilst PR does not correlate perfectly to Position, as a general rule, the top websites in a given sector will have a higher proportion of high scores. Google.com (of course) is a PR10 - although somewhat surprisingly other Google TLD derivatives (like google.co.uk) are not!