Personally: games, foobar2000, sharper font rendering, and better hardware support -- Mini's and iMacs are too weak, the latter has a silly integrated monitor I

Personally: games, foobar2000, sharper font rendering, and better hardware support -- Mini's and iMacs are too weak, the latter has a silly integrated monitor I don't want, and Mac Pro's are too over the top. OS X can't even use my keyboards properly without third party keymaps :/ Of course I don't do much real work in Windows - that's reserved for FreeBSD, Ubuntu and Debian on various real and virtual systems.