• 73% of U.S. Internet users believe that they are over-exposed to advertising, and 91% of those over-exposed to advertising would prefer using a search engine rather than being served ads
• Only 24% said their shopping habits are never influenced by advertising they encounter
• 56% said the Internet provides consumers with at least some ads they need or want each month (53% said the same of TV), while two-thirds wished ads were better targeted to their needs at least once a month
• 75% rely on a variety of sources to find local businesses - 75% start with search engines, 65% said print yellow pages were a resource, while half said they use online yellow pages.
  
• 76.5% were more influenced by a quality Web site from an unfamiliar business, than by a poor Web site from a familiar business.
  

And for some specific numbers regarding targeted ads, a recent eMarketer article reports that while click-through rates for banner advertisements on major Web destinations declined in 2006 from 0.75% to 0.27% (due to a surge in new ads and Web pages, mainly from social networks), click rates for targeted ads were 30% to 300% higher.