I don't mean to start an inevitable crap fest, but I've always wondered this. I've noticed that my Mac is very stable but I've moved straight from Windows XP to Leopard and never really moved onto Windows 7. I never really thought that there was a big difference until I saw this press release. "Portal (with the same code base across platforms, just different compilers) is one fifth as likely to crash on a Mac than on Windows. " Are Macs really that much more, on average, more stable than PC's with Windows? Are there any crash test or stability tests for comparison?