I've been a linux user since 1997 or so. I don't generally game on my linux machines though.

After visiting random websites and getting viruses (nothing sketchy), plus an interest in trying a unix based (or unix like) system for years, I slapped Ubuntu 10.04 on my laptop in 2010. Currently, I have three computers running versions of Ubuntu. Wine takes care of my pretty well for most of my games from gog.com (except a few like Alan Wake...)

Here!
Ubuntu on my desktop and at work. Mint+XFCE on my netbook (it's faster this way)

BTW: happy new year to everybody. Yes, I am still alive. I just don't spend that much time on the computer any more. :-)

I'm using Archlinux on my AMD Thinkpad for almost anything. Most of the old windows games I bought here run well on that system.
I do not buy new indie games here on GOG because a lot of them provide a linux version that I don't get here. Linux support is very important to me so I go to the Humble store instead.

I moved away from Windows over to Linux Mint & have been using it for about 10 months now. Dual booting with Windows 7 as I need to keep that installed for any games that I can't get to run in CrossOver, but with the current progress of Linux & rapidly improving Wine compatibility I'm hoping to eventually be able to dump Windows entirely.

Have been using Linux, specifically Ubuntu, since 2011. It has been fun but I'm thinking of trying Mint for a change.

Always looking for ways to do my things on GNU/Linux based systems.
Currently Ubuntu 12.04 runs my laptop from 2007, but when my desktop will be complete I'm going to test different distributions.

I started using Ubuntu frequently in 2012 thanks to a Linux exclusive app I needed for college. I resisted at first but since Ubuntu 13.10 it has become my main OS. Still using Windows for Steam though.

I know I'm great, but I am not a pengu...oh wait you mean Tux. :P

Been using Linux since 2010, started due to work, but now it is my main OS on my laptop (not on my desktop, though).
Xubuntu, switched over from GNOME/Unity when I realised how rubbish it was.

First tried with Mandrake in 2005, I used Mandriva until the KDE 4.0 release, and tried many other distros. I am more "rpm" than "deb", and enjoyed a lot OpenSuse and Fedora.
Since Mageia forked from Mandriva, I "came back", and I intend to stay with Mageia, using KDE or XFCE.

Kubuntu user here

I think the first ditro I tried was Red Hat 6.2
Since then I've tried many distros (Red Hat, Debian, Suse, Fedora, Slackware and others)

It has been my only OS for years, now

I use Linux exclusively at the moment: Manjaro XFCE 64-bit with Kernel 3.10.25-1-MANJARO.
I used to dual-boot Linux with Windows 7 and tried several distributions (Ubuntu -> Linux Mint -> Fedora -> Debian -> Linux Mint -> Arch -> Manjaro).
Now, everything I want to do can be done with Linux just fine (and most of the time better than with Windows), only gaming remains a bit problematic. Currently I play my GOG games through Wine, I do not use Steam at all.
So, if GOG would provide Linux support, I would have been able to replace Windows in every way and that would make me very happy.

OpenSUSE-KDE Have been for the past 2 years now.. plan on it for along time... for portable system its LMDE

I have duel boot. Windows 7 and Ubuntu 12.
I did also have a Mint laptop but my GF gave that away to an African family as part of her on going need to save the world.

I began using Linux over a year ago as a test and although with gaming I am still yet to transfer over permanently I use it mostly for personal things and some learning.
Mostly my Windows half of the computer runs the same programs as my Linux half. So when I do the final transition in time, it should be fairly easy as I am already running the programs on both systems.
I even went through all the effort of making my old Photoshop Elements run on Linux so I could use it there too.

My only problem currently is that I have used Windows for so long and all of my course work is based in Windows that I only get a little bit of time at any time to work with Linux, but every time I learn a little more.