Let me start off by saying I am not sure if this is new, in fact, I have a feeling it is not - so please let me know when this first came out.
If you search for teavana, staples, turbotax and so on, Yahoo will label the ads by the brand holder, with an "official site" label on the ad.
Here is a picture:
Keep in mind, Yahoo's search ads in the U.S. are powered by Bing, so this is something extra Yahoo is placing on the ads - above Bing.
Personally, I like this little touch.
Forum discussion at WebmasterWorld.