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Web Browser Statistics
Statistics about the browsers that people are currently using. These shouldn't substitute for finding out your exact audience, but they are a start.
Analysis of Browser Statistics from Three Sources Sep 2006 through Nov 2006
An analysis of Web browser statistics from three different sources for evaluating whether or not there is reliable browser support for CSS layouts.
Debunking Browser Stats
Lies, damned lies, and statistics -- why browser statistics are not as reliable as you might think.
GVUs WWW User Surveys
GVU surveys Web users to find out what browser and platform they use and many other things.