/hugs GameCube.
Apple and Nintendo... keeping my home Microsoft-free for over a decade now.
Which, in my experience, aren't worth the effort. If an app (including games) is good enough, it makes it over to the Mac. I love when Windows users slam Macs for a lack of games. To be clear, it's a lack of second-tier games that most people really don't give a crap about.
But, where I see Windows on a Mac being especially useful is in business settings, especially where you have mixed-platform work environments. I'm hoping I can talk my employer into letting me getting a new Mac with Parallels soon, so I can dump my PC and go back to having one computer.