According to latest Net Applications data, "In July on Windows 7, Internet Explorer 9 hit 18.5% share worldwide and 24.8% in the United States. There are indications that this strategy is working. Although Internet Explorer lost usage share on XP, on Windows 7, Microsoft increased global usage share, going from 54.6% in June to 54.8% in July."
And in the U.S., Internet Explorer share on Windows 7 grew 0.6% to 68.1%.
Microsoft has been pushing Internet Explorer 9 and Windows 7 as the best browsing experience on Windows 7 because of IE9's use of hardware acceleration and integration with the Windows 7 user interface.
See the chart below:
[Source: Net Apps]