Numerous studies in the SEO industry confirm that long tail keywords make up more than 70 % of all
searches performed on the
web, with only 30 % left for the
generic 1 - or 2 - word phrases.
Everything I could dredge up at the time linked to an odd one - page
web site (screen captured in a Yahoo
search cache here, its current iteration seemingly just expired, more info here) with the most
generic possible uninformative information about the ozone layer and global warming.