Microsoft’s Ryan Gavin wrote Wednesday that the latest version of Internet Explorer, IE9, has been downloaded 2.35 million times since its release Tuesday.

Gavin said that’s double the downloads for the beta and four times the downloads for the release client in the same period. Microsoft has seen its market share in the browser world slip, now below 50 percent, according to StatCounter. That’s down from market shares above 90 percent in the early 2000s. The latest numbers from StatCounter seem to indicate Internet Explorer is losing its share to Google’s Chrome, which also launched a new version this month.

And how are those download numbers by comparison? Well, Mozilla’s Firefox was awarded a Guinness World Record in 2008 for the “largest number of software downloads in 24 hours” when it pushed out 8 million downloads of Firefox 3, it’s last official version, in 24 hours. Mozilla is expected to launch Firefox 4 on March 22.

Rob gave his first impressions of IE9 yesterday. Have you tried out the new browser? What are your favorite features and top gripes?

Related stories:

Microsoft ships Internet Explorer 9

Microsoft is tired of Internet Explorer 6, too

Internet Explorer market share keeps eroding as Chrome's grows