Google now provides new features to control the ads you see on Google . If you search for something on Google you will see adword ads in sidebar. Now you can control to see all the ads or only a few ads. I do not know why Google added this feature.
By default you will see only some of ads at least a single ad or 1 ad in sidebar. If you click on show all advertise info you will see only 3 ads, again if you click you will see more ads. If you repeat this process then show all advertisers info will be disappeared.