I've been running OSX for 2 years now and haven't had any crashes other than printer screw ups (again needing updated drivers). There's no doubt a Mac running OSX is superior to other PC systems out there. I've got a Linux server sitting down south that handles web, ftp, DNS, database and mail services for a couple dozen domains. No more than an old 200Mhz 486 w/64Meg of memory, and it just chugs along happily day in and day out. It's constantly hammered 24 hours a day, is sitting unprotected on the public internet outside any firewalls, but uptime (as of today) is now 373 days 12 hours and 5 minutes since last re-boot (which was caused by a massive power outage that outlasted the UPS).
OSX is based on BSD code, which is even more mature (yet less supported), so it's not supprising that it is relatively trouble free.
Cheers,
Brad
