I especially use clean languages, ones that were designed with good taste. For compiled languages, I don't even want to use anything but Pascal, anything else feels like being a traitor and especially C++ and Fortran were designed with a bad feeling for taste. For scripting languages, I enjoy TCL. It's a clean alternative for both PHP and shell scripts, which both were designed with bad taste. It is also usefull for database programming, I design PostgreSQL functions with it.

I consider Python is also a nice language, however, I do not use it.