Actually, it’s not so much the ads that bother me; and of course I realize they’re a revenue stream for the websites that run them. What bugs me is the invasive trackers that websites run as background processes.
This website isn’t a major culprit as it is currently only running seven of them (Google adsense, doubleclick, Google publisher tags, Google analytics, SumoMe, GA Audiences, and Gravatar) but many websites use over 20 of them when you browse them. Some of these trackers are used to target and deliver advertising, some of them are used to track your behavior, location and activity. As just one example it’s how you get an email saying something like “Hi, we noticed that you put an item in your shopping cart but didn’t complete your purchase. Would you like to reconsider?”
Website tracking and analytics is an interesting topic typically done to enable advertisers to get the best bang for their buck. I’d prefer to “enjoy” it from the outside and not the inside.