Share 'What flavor of Linux do you use?'

Hello all, I am curious to know what distributions of Linux are in use out there. Perhaps you could list your distribution, along with what environment it is used in (eg. small business, healthcare, government). It would be good discussion and I'd love to learn what else is out there. I use Gentoo Linux in the following capacities: 1. Web server / E-mail server (hosting) 2. Firewall / Content F…