I know that IE users are more likely to click on ads, but I haven't heard much about which versions are more likely to click through. Most of the visitors I get to my sites via adwords are on IE 7 and 8; but that's just anecdotal evidence.<p>So, if you've got something that says IE 6 users are more likely to click on advertisements than any other version of IE, I'd love to see it - maybe we should still be paying attention to them.