In the Official Google Blog, Nick Fox points out that Google is rolling out “ads in new places.” These locations include:

Image ads in Google Image Search (SERoundtable coverage and a foreshadowing post)
Sponsored videos on YouTube (SERoundtable coverage)
Text ads on Google Finance, which was rolled out on Monday. Search Engine Watch Forums member abbottsys calls this a “financially smart” move, saying:

Google will also be rolling out ads on news refinements in the actual search engine, so that if you click on a news link, there will be text ads nearby.

Forum discussion continues at Search Engine Watch Forums.