To my astonishment, the problem has turned out to be a bad power supply after 
all.  I didn't believe it until some of the SCSI drives in the same box started 
acting up also.

Score: ZFS: 1, $180 OCZ PowerStream 600: 0   :)

I would still argue that a salvager would be a useful addition to ZFS for 
situations like these.  While I managed to back up most of the most valuable 
data before I lost the pool, as it turned out there were a couple of 
recently-modified files I didn't have copies of.  I wound up writing a C 
program to search the disks for strings that I knew were in these file; for 
each match, reading in the disk contents in the vicinity with `dd'; and poring 
over the data with Emacs to see if this was the version of the file I needed 
and if so, to pull out the contents.  This mostly worked, but was tedious.  
Given the amount of redundancy in a ZFS pool, it seems like a salvager should 
be able to recover a lot of stuff (not that it will be easy to write one).
 
 
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