Bing: why is this being called a Google-killer?

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The much hyped Microsoft Bing has launched. When I first went to Bing.com, it took me to the UK main page. When I changed my Settings to include my location (Toronto, Canada), however, I got the U.S. version of Bing instead. I haven’t had a chance to thoroughly test out this new search engine yet, but so far it doesn’t seem much better than Google, so I’m not about to switch. What about the rest of you? Has anyone found anything super-fantabulous about Bing?