For example, I searched for the title of one of my favorite short stories, "The Garden of the Forking Paths." Both engines returned nearly identical results, albeit in a different order. Bing's related search suggestions were for "Summary Garden of the Forking Paths" and "Analysis Garden of the Forking Paths," both logical suggestions for somebody who wants to proceed from general information about the story -- or perhaps just wants to find the story online -- to more detailed examinations of it. With search results for the two engines being so similar for the moment, the related search suggestion feature could be the real differentiator between Bing and Google.
Of course, this is highly unscientific testing, and there will likely be plenty of tweaks to Bing in the future, but at the moment, it has at least closed the results-quality gap that had existed between Google and Microsoft Live Search. That's a good start, but it'll take an even stronger showing to unseat a giant like Google.