What percentage of search engine users click on organic search results as opposed to the paid listings? This question was asked on a Search Engine Watch forum. unfortunately the most recent public statistics seems to be a 2004 iProspect report that states:
Google – 72.3% organic, 27.7% Paid ads
All engines – 60.5% organic, 39.5% paid ads
If you have a link for more recent stats, send it on.