Revolution is a company that provides commercial support and tools for the statistical programming language R (see our previous coverage). Kaggle hosts data analysis competitions for organizations such as such as Deloitte, NASA, Wikipedia and The Heritage Health Network.
Kaggle reports that 50% of its contest winners submit data models written in R, and nearly 1/3 of contestants cite R as their preferred data analysis tool. David Smith of R-bloggers highlights this chart of the results:
Revolution has published a white paper on the use of R in Kaggle contests.