[Canada-Man]

My iMac kept crashing until I realised I should't be repairing permissions. It stopped crashing. Then when I installed Panther it started crashing, and it kept doing it for a few months almost everyday. I changed the RAM last summer (the problem was not Panther) and it didn't crash once since August 2004, and I use it everyday.

So basically, if you use commercial apps, if your computer is in good hardware condition, if you do regular maintenance, and if you don't play in OS X where you shouldn't be messing around, you are a lot less likely to get a crash.