Earlier quoted context omitted.
I think Danny Sullivan over at Searchengineland has done a better job of chronicling the changes but to give you a flavor, the size of the ad space before the first organic has grown tremendously, the injection of Google properties (G+, Youtube, etc) has further pushed on search results. When a buying intent is detected the 'shopping' bar activates which only shows shopping results from people who advertise on Google…
I performed your experiment and it didn't seem to match your conclusions. My search was: jwt web toolkit The search page itself had no Google ads on it. The top link was the homepage for the toolkit project. There were no ad links on the page. The second and third links were for wikipedia, which contained no Google ads. The fourth link did have Google ads on it. The fifth and sixth lengths did not. The seventh link d…
A query like "LA Car Rental" will give you an idea of what the parent post describes.
If you want to stick closer to the tech niche, try "build iphone app". Even the query "java profiler" gets me four ads on the page.