In an article looking at once-niche programming languages that are now being deployed in businesses, R is named as one of 7 programming languages on the rise:
R is another Swiss Army Knife of numerical and statistical routines for hacking through the big data sets -- collections big enough that it might be better called a Swiss Army Machete. Lou Bajuk-Yorgan, senior director of product management for Tibco's Spotfire S-Plus, says its software is used by a number of clients who are studying how business or engineering projects might work or why they fail to work. Analyzing weather patterns to find the best places to build wind-powered generators is one example.
The other languages names are Python, Ruby on Rails, Matlab, JavaScript, Erlang, Cobol(!) and CUDA.
InfoWorld: 7 Programming Languages on the Rise
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Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).