I've only spent a few hours checking out the Bing search engine, but, man, I'm impressed. What's impressive about it?
Simplicity. That's the key nowadays with all of these banners and buttons and graphics. Just let me search, give me the info, and move on. That's what Bing appears to do. I like it. Do I think it will give Google a run for it's money?
Who knows? I don't and anybody who says they do is crazy. Stuff happens behind closed doors that nobody ever knows about.
But as a search engine, and nothing more, Bing works. That's really all that matters in the end.