Today is the first time OSX bailed on me. The circumstances were the following. I usually let my new battery drain completely before plugging in the power cable. This morning, I hooked up my iPod nano, and had the machine run on battery. After a few hours, the system gave me a warning to plug the machine in or it would go to sleep. I decided to let it proceed. After the battery was sufficiently drained, OSX automagically went to bed. Upon plugging in, and waking up, OSX told me that a device had been removed prematurely. Obviously I had forgotten to unmount the iPod. iTunes started up, and mounted my iPod just fine. I turned to Colloquy to state that I was back, when the screen got covered in a gentle grey tone, and a square apeared, neatly centered on it, saying that I must restart my machine.

Upon restart, OSX told me it had crashed, and lo! a kernel panic had occured.

Unresolved kernel trap(cpu 0): 0x300 - Data access
DAR=0x000000000000008C
PC=0x00000000002C8604
Latest crash info for cpu 0:
Exception state (sv=0x279EB280)
PC=0x002C8604;
MSR=0x00009030;
DAR=0x0000008C;
DSISR=0x40000000;
LR=0x0003C744;
R1=0x125B3DC0;
XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x002C85AC 0x0003C744 0x000A9914
Proceeding back via exception chain:
Exception state (sv=0x279EB280)
previously dumped as "Latest" state. skipping...
Exception state (sv=0x2817F280)
PC=0x00000000;
MSR=0x0000D030;
DAR=0x00000000;
DSISR=0x00000000;
LR=0x00000000;
R1=0x00000000;
XCP=0x00000000 (Unknown)

The PC being 0x0 in that last state is midly discomforting, though I do not know for certain if it is relevant to this crash or if the information shown is somehow wrong.