Paid Advertising on Google and Bing

Some of you may have seen Bing's ads accusing Google of having only paid results on Google's Shopping Page.  I think Bing has a point, but on many of Bing's pages it is not always clear what is paid advertising and what is a search result.

The take away from this is that ad Google and Bing desire more revenue paid results over time will push aside natural search results.