Yep, you read that correctly. I kicked off the first Time Machine backup of my brand spanking new Apple MacBook Pro and after completing 10GB of the 30GB backup, it crashed OS X "Leopard" and forced a hard power off. I was speechless. I never would have thought an application in OS X could take down the system like that, but sure enough, I had this pseudo black screen of death telling me I must hold the power off button down, then turn the machine back on to recover. I said pseudo because it was a really dark partially transparent background with bold white error text. It certainly got my attention.
I have since managed to have Time Machine complete the first full backup so we'll see what happens over time... Not a very good start. One thing is for sure, don't bother ever trying to tell me apps never crash on OS X, Linux, or whatever. It happens to the best of us.
[UPDATE] OS X also crashed when I plugged in a 2.5" USB drive enclosure. In both cases I uploaded the logs and information to Apple. I think the USB issue is going to be harder to fix. Anytime electricity is involved, things get tricky.