Understand that Bing is a good search engine. It may even be an excellent one. If you ever use it, I think you'll love it. Bing actually organizes its general search results better than Google does, and does an admirable job of predigesting the Web for you. Not that any of that really matters.
... If you're living in Google's services (or Yahoo's, for that matter), it's unlikely you'll ever spend much time with Bing. That's a shame, because Bing really is search done right.
...It's likely that Google will match many of Bing's features in time. But I don't know how quickly Google can turn the boat around on what I call "clutter creep." Years ago I lauded Google for staying the course on its clear and uncluttered design. The homepage still follows this model—though not to the letter (hey, there's an offer to download Chrome!), but the search results have become a sea of blue links. Contextual ad links are everywhere, and I find it harder and harder to know which results are relevant. This is something Google must fix, and soon. Not that I think Bing will somehow topple Google in the interim. In the world of search, Google is the Microsoft and Microsoft is the Apple—the clear underdog. The difference, of course, is that I'm not sure anyone is pulling for Microsoft to triumph over Google.