Todd Allen on Dilbert, Google and Blogs posted November 1, 2005
Those Google Ads are on the Dilbert blog, not on the main Dilbert site with the strip. They're using standard, image-based banner ads on that site. Contextual Ads like Google Adwords are the de facto standard for blogs, so the fact Scott Adams is using them on a blog is pretty much a sign that the original columnist had run out of material.
Google Ads are served based on the text on a web page and in the text contained in certain tags in the HTML, so unless you have a lot of copy surrounding your online comic, it is questionable how well Google Ads will be able to function, relative to thier business model.