Neilsen have announced that Bings search market share in the United States has increased in their market share by 51% in the past year.

From July 2009 where Bing had a 9% market share to July 2010 where it has increased to 13.6%.

Google meanwhile has decreased in that same period, although only down by 1% to 64.2%

Obviously Google is still the King in this area, although now that Yahoo is finally showing Bing results in the US, this means that Bing now control nearly 30% of the total market share.

Taken from the Nielsen blog