I do the majority of my programming work in Perl. I like Perl because it's a power language. It has a lot of nooks and crannies, just the way I like it. Perl fits my twisted mind, and Perl lets me do anything with it they way it pleases *me*. Perl is my slave, and I'm not a slave of the language (therefore I strongly resist all attempts of people who say "this is the way you shall do it" - too bad perlmonks.org features too many of those people).

Other languages I program in:

   shell:  I love its quoting style - it's better than Perl.      
   awk:   (Typically in combination with shell).
           Shell and awk are present on all Unix systems (and I
           don't give a rats ass about non-Unix systems), Perl
           isn't.
   C:      For speed, low memory usuage, and portability. It doesn't
           require Perl to be present.
   SQL:    Hated by many, adored by the few who understand the
           power of set algebra.
   LPC:    It's simple, and MUDs are fun.

If I had more time, I would learn, or learn better: Python, REBOL, Haskell, Eiffel, Ada.

Abigail