After 5 years spent with my PowerBook(ug13), which was an admirably well conceived and 1 year with a MacMini(Luke); as Luke was meant to become a multimedia center, he is now coupled with a nice FullHD TV. I am back using Linux Debian for my daily work and no computer for my private stuff.
Before switching to Mac I was living a happily windowless live( the 5 years before my switch to mac) with Linux. The last distribution I used for at least 2 years was gentoo. But it went from hard to very hard and time consuming to manage; and I had less and less time to be my own system developer/administrator, so the switch to Mac.