In case you haven't been keeping up with the competition for browser market share, the popular new Firefox browser and its bigger cousin Mozilla have reached a share of about 8.45%, and growing. Not bad. If you throw in the users of Netscape 7 and 8 (a branded version of Mozilla), it's a little higher yet.
I checked statistics from the top five sites here at stblogs.org, and found data consistent with that figure: the numbers varied from one weblog to another, in a range of 7.03% to 10.43%.
Not bad.
Especially considering the huge advantage IE has in being an integrated part of the OS the vast majority of people use. There's also the fact that it had the field pretty much totally to itself for quite some time, from the release of IE 5 to the time when the first usably stable release of Mozilla happened (or you could even say until for the first usably stable version of Firefox was released). It's really delighting that the Mozilla project has made so much progress.