Research reports disagree on whether Bing is trailing or leading Yahoo

Reports released this week showed that Microsoft Corp.'s Bing search tool continues to gain ground in the search engine wars, but how much ground it's gaining is a bit up in the air.

For the second time since Bing's launch just over a month ago, StatCounter Global Stats, which analyzes Web site traffic, reported that the new search engine's market share has passed that of Yahoo Inc.'s search tool. According to a StatCounter report released today, Bing held a 12.9% share of the U.S. search market, while Yahoo held 10.15% at the start of July.

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