"If you're based in the U.S. you may already have spotted or clicked on the different text and image ads we’re testing on the results pages of Google Image Search. And last week you may have noticed we launched Sponsored Videos on YouTube — a great example of matching ads to content. In addition, we are today launching text ads on Google Finance in the United States. We're also looking at how best to show display ads on Google Finance. And later, in the very near future, we will start testing text ads on a small number of news refinements within Google Search — so if, for example, you type "iPod" into Google.com and then click on the news link on the upper left-hand side, you might see text ads alongside those results."
Official Google Blog: Ads in new places