Of course, it depends on what you want. I would not create CBT (Computer Based Training) with Perl, for that I would use TenCORE.

But for system management I've used and I will again use Perl. And for database management. And for interactive webpages. Etc. I don't like Javascript or PHP, just a feeling, just the looks of them. And Java is of course butt ugly. Maybe I would do some C for specific speed related tasks, but that language would take me a while to pick up on again.

Therefore: Perl.