Granted, Google’s ads are the least intrusive, any pop-up balloon ads by Vibrant are much worse (Example at ExtremeTech). As soon as I see Ads By Google or those links with two underlines on a site, they immediately lose any credibility with me. First off, its looks unprofessional and cluttered. Secondly, if the site has such ads, it probably has really poor navigation which is not user-centric. Ads tell a lot about the website’s “backers.” It shows that the business model is “make money however we can,” and not, “let’s produce something great for our users/consumers.” Boo on anyone who uses them.