I am a long-time UNIX guy. Mac OS was never on my radar until the UNIX-based OS X was released...and I still never seriously considered purchasing one until the low-cost G4 mini's made their debut. I ditched the kids' linux boxes and got them each a mini, bought a mini for myself, and bought the wife a G5 iMac.
Post Intel transition...my kids have a CS mini and my wife has my "old" 1st gen Macbook. Currently, I have a thinkpad X60s with Ubuntu over here in the desert.
My wife and kids love iTunes and all the great multimedia "things" they can do with iLife. My kids have a wide range of educational software available to them (that was always the big issue when they used linux). However, even though I like the idea of those tools, more often then not, when I'm in front of a Mac, I'm staring at a couple of xterm windows and a web browser. And these days, Xen suits my virtualization needs far better than Parallels.
The funny thing is...while contemplating what new computer I will treat myself to when I get home from Iraq, the only real reason I'm wanting a Mac is FOR games! (specifically, Madden '08 (when it is released), World of Warcraft, and the upcoming StarCraft 2) I DO really like OS X's GUI, but for the most part, linux suits my needs perfectly.
So, count me as someone that will be purchasing a new Mac BECAUSE of games...not in spite of them.