After hearing about it a lot, I have started using Scala recently and am finding it really fun and powerful to use.  Scalala is a nice analog to numpy.  The documentation needs to get better, but I think it’s coming along.

I just found a good introductory video by the creator of the language, and if you’re curious whether this is a language you’re interested in playing with, I think it is a good place to start:

http://www.youtube.com/watch?v=zqFryHC018k