It’s not going as fast as it has been, but comScore reports that February was in fact a month with a small growth in Bings share of searches in the USA.
Bing (Microsoft sites) went from 11,3% to 11,5%, but unfortunately Yahoo! went 0,2% down, so MicroHoo had a unchanged share of the searches.. still there’s a combined share of 28,3%!
And yes, Google went 0,1% up to 65,5%.