Tony Chor, the Group Program Manager for the Internet Explorer team claims 100 millionth download of IE7
I'm pleased to report that on January 8th, we had the 100 millionth IE7 installation. However, even more important than installations is usage. According to WebSideStory (the company we use to measure browser usage), as of this week, over 25% of all visitors to websites in the US were using IE7, making IE7 the second most used browser after IE6. We expect these numbers to continue to rise as we complete our final localized versions, scale up AU distribution, and with the consumer availability of Windows Vista on January 30, 2007.
If you haven't installed IE7 for Windows XP yet, you can download it here. You won't need to download it for Windows Vista as it has IE7 built in with all the same features as the XP version, plus Protected Mode.
Link: IEBlog Article