Okay, I hate to rain on everybody's parade here, but I've had to reboot for one more reason than a software update or if I've been out of town. Have any of you ever had a window appear, on a translucent background identical to that of Dashboard, that tells you that you have to immediately shut down your computer? I've read someone compare it to the Windows "blue screen of death", the only difference being that it looks nice and less ominous. Whenever it's appeared, I've had no choice but to hold my power button and force my Mini to shut down.
I only see this window once every couple of months on average, and if I recall correctly it's happened mostly when problems with peripherals are detected, like my external HD. Actually, I have no way of pinpointing exactly why this has happened to me over a half-dozen times in nearly two years.
So sorry, Macs DO have their instability issues like every other OS, but when I compare this with my past Windows experiences, my Mac issues are a mere drop in the bucket. You couldn't give me a Windows computer without me selling it and buying a Mac instead. But I just wanted to give you a reality check about Macs - they aren't perfect, but they're close.