So the topic says it all, what Linux distribution you use and why?
I have been a Linux user for quite a while now, and have gotten used to use Ubuntu as my primary system. I also use Ubuntu in both of my servers, fileserver and general server (www, mumble etc.), and in my laptop.
I do test other distributions quite often in my test pc, but none has convinced me to switch off from Ubuntu. The Unity desktops ease of use is just superb, and I can perform my day to day tasks like a baws!
If I had to do serious working with my pc, and have like bazillion monitors, I would prefer something like Gnome 2 as my desktop environment.