For those keeping score, here’s how the rankings of search engines have changed since Microsoft entered the race with Bing six months ago.

Google, of course, remains the runaway leader and there are no signs that its market share will do anything other than keep inching up. It went from 65 percent in May to 65.6 in November, according to data released by comScore to analysts late on Tuesday.

No. 3 Bing rose from 8 percent in May to 10.3 percent in November, a two-year high for Microsoft, whose previous search engine, Live Search, had been on a prolonged slide. The rise, fueled in part by a costly marketing campaign and rebates through its Cashback program, has been slow but steady, which is no doubt seen as good news up in Redmond. (In an apparent effort to keep up its forward momentum, Microsoft released a Bing iPhone application late on Tuesday.)

More: http://bits.blogs.nytimes.com/2009/12/16/google-and-bing-keep-rising-while-yahoo-drops-again/