This one is a toughy.

My main computers is my 2 GHz iMac G5 17" running 10.4.9. It will also be running Ubuntu/Kubuntu (haven't decided which one yet) 7.04 "Feisty Fawn".


However, I also now have Ubuntu Feisty running on my work laptop (HP nx9010) with Compiz enabled and I'm very happy with it.

So even though I voted for the Mac running OS X, I have to also include "Mac running *nix" and "PC running *nix".