Last time I checked on the number of R questions on StackOverflow, back in June 2011, there were 5000. Today, there are 23,649. (For comparison, there are 15,649 questions about Matlab and 971 questions on SAS.)
If you use Twitter, thanks to Trey Causey there's now an easy way to keep up with new R questions posted to StackOverflow. Just follow @StackOverflowR, which tweets new questions as they appear. Though a feed of questions with newly-accepted answers would be nice too...
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