martinibuster - 4:11 am on Jan 4, 2012 (gmt 0)
Why hasn't anyone at Google thought of introducing a ranking of sites on the lines of the services provided by Quantcast or Alexa.
They have. It's called Google Trends for Websites [trends.google.com]. ;)
It's a great way of getting an idea of what the traffic quality is like at certain sites, regardless of PageRank. I prefer traffic metrics from sites like Quantcast and Google Trends for Websites over Toolbar PageRank. If the site doesn't register a blip on Google Trends then that is a sign that it may be useless for advertising purposes.