I also use a Mac running OSX (Tiger), and switched over about three years ago. I don't know if I'll ever go back to a Windows-based computer, especially after using Vista on a few machines owned by friends. I'm considering upgrading to Leopard, but I usually wait for my boss (who is also a Mac loyal) to do so first and give me his reviews.
Don't get me wrong, I still have XP installed on my Mac (Bootcamp!) so that I can use some statistical software packages designed for a Windows platform, but I literally only boot into Windows maybe once a month. I just really enjoy the OSX interface, and I actually LIKE that most games aren't available for Mac.. I'm more likely to focus on my classes that way.
