I work in IT Security in the Federal Government. I've been heavily involved in firewall management, DNS maintenance and upgrade for Canadian Goverment-owned domains. I have been managing BIND-based DNS servers since 1998. I'm doing less right now, although I now manage my own domain using a web interface, which I will demonstrate. I was also involved in PKI since 1998, and cryptography. I'm rather limited in the level of details I can disclose, of course, by the nature of security.
I'm using Linux for several years now, mostly Ubuntu. I'm a big fan of Linux, although I'm not an expert.