Before anyone asks, yes, I've a ticket open with AppleCare on this one. I've been experiencing intermittent filesystem corruption. Now, there is a chance that this *could* be a firmware issue. Not sure yet. This actually had to be escalated to engineering level support, so I won't get a response back until as long as Wednesday. I had to submit a fair number of logs and system data with Apple's Capture Data utility. As a fun aside, the filesystem corruption "mysteriously disappears". For example, it may be detectable while the volume is mounted and I'm in OS X, and then it's undetectable while booted off the restore DVD to attempt to use Disk Utility there. And vice versa. I ended up calling AppleCare after noticing some serious wonkiness with Time Machine, where it always wanted to process 24,000 or so files before it would backup any number of files (including zero). There were also some cases where certain apps were completely incapable of launching, or file I/O came to a standstill. So I'm about 8 weeks after placing my original order... and I still effectively don't have an iMac in my hands (that's problem free).