I have been playing around with MacOS X alot lately and I must say I'm in love. It's beautiful, it's has the stability of *nix and the look and feel of MacOS, what more could one ask for (oh well, look and feel of AmigaOS then
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I have been playing around a little with X11 on the Mac aswell, and it seems GTK apps can be ported to MacOS quite easily, I tried Gimp, which ran just fine on a friends Mac. Way cool.