That's a pretty nice thread here! Good idea.

I own 3 machines ATM. First there is my custom desktop, which is my main machine. That's where I spend all my time. I got 2 hard drives in there, one with crux on it for everything linux related (IRC, coding, web browsing, mails or whatever), and the second one running Ubuntu, for steam as I got tired of steam dirtying my crux install with 32 bit libraries (I don't use it for anything else really).

The second machine is an old desktop a friend gave to me that I use as a personnal server. It runs alpine and I only connect to it when I write new blog posts.

The last one is a notebook I take with me on trips, running elementary OS (I need to switch though, this shit runs terribly slow). I installed it before my holidays so my girlfriend and brother could use it to dump their pictures/videos without any help from me.
I don't use it much, so everytime I need it, I expect it to work.