How can I get demographic and behavioral information about the users of various websites ? For example, say the target market for my product/website consists of 18-35 year old males, who are interested in video games and online video sharing. I want to select websites that are frequented by such users, so that I can place banner ads on those sites. How do I select such sites. I have checked out Doubleclick's ad planner, which gave some limited information. What other sources provide such information about websites ( ad publishers ) and can help plan a targeted advertising campaign ? Thanks in advance, Vikas Phonsa