Apparently those rumors of Bing declining in September weren't true after all. Microsoft's assault on Google has continued unabated through the Fall and the Bing search engine can now claim almost 10% of the U.S. search market share. (TechCrunch) ComScore reports that Google is also up, gaining .5% share this month, and 2.4% year-over-year.
Bing's growth since its launch in May is impressive, but it shouldn't be seen as a sign that Google is in any trouble. The fledgling 'decision engine' still has yet to nab any market share away from Google. Once more, its monthly gains have come at the expense of Yahoo, who is down 3% this year. Since Yahoo is already promised to Bing, these gains aren't quite as impressive as they sound.
That's not to say Bing can't pull any market share away from Google. It's just that they haven't yet, and they're going to need to bring something more to the table if they want to. It's been five months, and Google users have proved to be just as loyal as ever. It's not good enough for Bing to be a decent, reliable search engine. It's not even enough for Bing to be great. They have to be revolutionary if they want to rip market share out of Google's hide.