One of the perks about Adsense is that they scan the content of a site and show relevant ads for that site instead of just random ads. However, they have changed here recently and now show ads based on users past browsing history. I personally do not like this. One reason is, most of the ads I see are places I already know about. If I go to Newegg.com and order some computer parts, I will start to see Newegg ads on other sites I visit. This does not really seem effective, because I already know about Newegg, so why show me and advertisement of them on a cooking blog? I think Google is doing a real disservice to people using Adsense and to the advertisers.