Julia (http://julialang.org) is a relatively new language designed for scientific and technical computing. I have an interest in this area so I've been playing around with it. I'm a pretty regular user of the R language, as well as Python and if Julia lives up to its goals it will be able to replace both of these for numerical and statistical work.
At the moment, the language is under heavy development so things break regularly (but get fixed quickly) and generally change under you more often than I would like. I'm taking a course in simulation and modeling this semester and my goal is to code some of the assignments in Julia (in addition to the Python versions required for the course). This will give me a great way to learn how to do things efficiently in Julia (for example, loops are apparently preferred over vectorized operations in at least some cases in Julia) while letting me do some naive benchmarks of my own for comparison.