J

[Bailey, Michael L [NTK]]

Anyway it does seem like J would be a cool language to learn on. Oddly,
they had a long discussion a few weeks ago on their mailing list about a
good programming language for beginners (which can be found in their
mailing list archive on the same site)  -- threads like that don't
usually end up with one clear answer, but there were a lot of good
comments.

Here's a list of users from their website 
The following are a few of the corporate and academic institutions that
use J:
Cognos * Bayesian Enhanced Strategic Trading * Fax Focus, Inc. * Hewlett
Packard * Intel * Korea Telecom * Luen Thai * Maple Partners * Microsoft
* Niagara Mohawk Power * Nikko Securities * Novell * Okada Denki Co.
Ltd. * Pivotal Technologies * SAP * Syngenesis, Inc. 

Duke University * Harvard School of Public Health * Keio University *
Lafayette College * Penn State University * Rochester Institute of
Technology * Trinity University * University of Alberta * UCLA *
University College of the Cariboo *
(I wonder where the college of the Cariboo is, don't want to spoil my
mental picture, which is full of reindeer, by looking it up...)
 University of Florida * University of Haifa * University of Houston *
University of Iowa * University of Massachusetts (Amherst) * University
of Wisconsin