Google has been the undisputed leader in search and Internet advertising for what seems like forever, and despite the many fruitless attempts to challenge their dominance, they remain at the top.

However, a new union of Google’s biggest rivals may finally pose a threat to AdSense. Media.net has brought together Microsoft’s Bing search engine and its tenuous ally Yahoo to create Yahoo Bing Network Contextual Ads, which, like AdSense, will offer contextually-relevant text-based ads on websites. And the best part is that these ads come from all of the advertisers that are already buying millions of search ad impressions on Yahoo and Bing through the Yahoo Bing Network (YBN).

But plenty has already been written about the details of YBN Contextual Ads, but that doesn’t answer the big question on everyone’s minds: Just how do they stack up to AdSense?

Click here to read more about this exciting face-off.