Ron Schenone at Lockergnome makes some consideration on market shares of different browsers (full article at http://www.lockergnome.com/blade/2009/07/06/internet-explorer-continues-to-lose-market-share).

I think that Firefox acquired a bigger market share, but IE, despite of versioning, still has a quite predominant position.

This article as a comment at http://www.lockergnome.com/blade/2009/07/06/internet-explorer-continues-to-lose-market-share/#comment-186625