A friend of mine who's a physicist claims that he's so used to Mathematica that he uses it for everyday scripting tasks, the way other people use Tcl or Perl.
Yeah - I met a chap at an openbase conference in 2005 that was using it for professional web-application development. I've been intrigued by the idea ever since. I'd be interested to hear more stories from people who really leverage it like this.
