*“Explicit Core Search” excludes contextually driven searches that do not Both Bing and Yahoo, who’s search is powered by Bing, have gained market share, adding a combined 0.4%, while Google was down 0.3%. It seems while Google is attempting to attack Microsoft’s cash cows with its Chromebooks they may want to spend more time protecting their own major revenue earner. Via Winrumours.com
comScore Explicit Core Search Share Report*
April 2011 vs. March 2011
Total U.S. – Home/Work/University Locations
Source: comScore qSearch
Core Search Entity
Explicit Core Search Share (%)
Mar-11
Apr-11
Point Change
Total Explicit Core Search
100.0%
100.0%
N/A
Google Sites
65.7%
65.4%
-0.3
Yahoo! Sites
15.7%
15.9%
0.2
Microsoft Sites
13.9%
14.1%
0.2
Ask Network
3.1%
3.0%
-0.1
AOL, Inc.
1.6%
1.5%
-0.1
reflect specific user intent to interact with the search results.
In March Experian Hitwise announced that Bing +Yahoo’s combined search market had hit the 30% mark, and now Comscore agrees that in April the two search contenders have also hit the mark. 
Comscore now also agrees BingYahoo had 30% of the US search Market, taking share from Google
