Hitwise Puts Google Over 70 Percent
at http://www.webpronews.com/topnews/2008/08/12/hitwise-puts-google-over-70-percent

and

MSN Taking the Brunt of Google's US Search Blitz
at http://www.pcworld.com/businesscenter/article/149746/msn_taking_the_brunt_of_googles_us_search_blitz.html

The Hitwise's blog entry:
http://weblogs.hitwise.com/heather-dougherty/2008/08/googles_share_of_us_searches_h.html