Google AdWords show up on the right side of Google search results. Sites pay to have a message and a link to their site when people type in specific search words. They actually pay per click by the user, so if you see a Theme Park Review ad like this, save the Alveys some change and don't click (because you're already well aware of the site). Earlier in the day, ads for Theme Park Review were showing up for "roller coaster", "roller coasters", and "theme parks" search results.
I was wondering why they're forayed into advertising the site.