SLS, then Slackware, then Redhat, then Fedora, now CentOS. But I've always had other boxes around like FreeBSD and Gentoo.
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If you use your PC for both work and non-work activities, or anything else like that, one way to keep yourself from distracting yourself is to maintain separate logins.
For example, I have a desktop PC in my home office that I use for both work and for pleasure/gaming/etc. It's usually running Windows 7. I maintain two independent desktop logins - one for work, one for non-work. In this way when I'm on the clock for work, my whole environment says it's work time. That cool web site I was reading last night? The bookmark for it is on the other desktop; I can't see it from here. When I finish work at 5pm or whatever, I switch desktops, and now all my work-related stuff is invisible again. Likewise I have separate mailboxes and domain names, separate logins on my Linux box,
Take care of yourself and your family, and good luck in the future with whatever you do.