Sorry to jump to the end of this thread without reading it in full, but if this site is using Google AdSense, then it almost certainly includes other services acquired by Google, including DoubleClick.
Some ads served will be context based ones, chosen on account of the content of the page itself (so related to the subject, or keywords picked out from the web page).
Other ads will be served using cookies on YOUR machine, stored by companies that advertise using DoubleClick - like Amazon and many others. This does mean you'll now get some ads that are very relevant to you and ONLY you. This might be a particular product you searched for, with the obvious thinking being that you're more likely to click on something you actually looked for!
I am against ad blockers, as ads support these forums. I'd rather have the odd advert that is of interest to me, and clicked, than be asked to make a donation or subscribe. The rest of the ads I simply ignore.