The recent percentage of Google is 55.2 now.

The following news has more details about the situation of Web searches:

"Microsoft's search share lost ground once again as competitors Google and Yahoo gained, statistics from research firm Nielsen/NetRatings indicate. Released Monday, the study showed that once again Microsoft was having trouble holding on to any gains it had made previously."

Link to the BetaNews article:
http://www.betanews.com/article/Google_Continues_to_Dominate_Search/1179847011

It appears that the press release itself is located at
http://www.nielsen-netratings.com/press.jsp?section=ne_press_releases&nav=1

-> see 05/21/2007: Nielsen//NetRatings Announces April U.S. Search Share Rankings, opens a PDF file