a new kind of crash

[David Crump]

Thanks to everyone for your help so far with my problem.  It actually 
got worse before it got better.  I had two crashes (kernel panics) the 
same day, and iTunes was not running, so that is no longer suspect.

<snip>
"Just a guess, do you have less than say a Gigabyte of harddisk space 
left?
Then it might well be the virtual memory eating it up.
</snip>

Response:
I had 1.5 GB of space left on the 10GB drive.  I freed up another Gig, 
then ran Plus Optimizer, and it was pretty badly fragmented.  I 
optimized the drive, and so far it hasn't crashed on me.  It actually 
brought up another question for those of you with more experience with 
Disk Warrior and Plus Optimizer... I got this message when trying to 
optimize the drive:

<snip>
The directory is anchored because it is always in use.

1 anchored file(s) found.

Anchored files are files which cannot be moved by PlusOptimizer. When a 
disk with anchored files is optimized, there is a possibility that 
other files or the free space will be fragmented around the anchored 
files.

The directory is always in use and cannot be moved. Normally it is not 
necessary to move the directory but the directory on this disk is 
fragmented.
</snip>

Is there any way I can fix this, or is there not a problem?
Thanks,
Dave.