Doug Henschen of InformationWeek published an article looking at low-cost alternatives to legacy statistical software, including SAS. The second page of the article looks at the growth of R, and the offerings of Revolution Analytics:
Four-year-old Revolution Analytics provides commercial support for the R programming language as well as tools, integration, consulting and training aimed at making an open-source product enterprise ready.
Riding R's coattails is a good idea. It's used by 43% of data miners, according to the Rexer's Annual Data Mining Survey.
InformationWeek: Low-Cost Options For Predictive Analytics Challenge SAS, IBM