By day, I'm a web developer at a large public university using your standard LAMP set up: Linux, Apache, MySQL, and PHP. By night, I play with Perl/Python and C. I tend to avoid non-browser environments on Windows, but I'll do GUI or terminal programming on OS X and Linux. I'm not too shy around AVR microcontrollers either--though that's a bit of a hobby.
I hacked together an OpenID provider just to log in to Stack Overflow.