Odd Finder Crash Issue

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I have a user who was for some time experiencing her Finder crashing and relaunching randomly. It used to happen to her multiple times a day with no consistency. We upgraded her to Parallels 8, thinking that references to Parallels near the time of the crashes might be the cause, but now they simply happen less frequently. The latest occurred today at 11:54am. I've been beating my head against a wall with this issue for months, and none of our other Mac techs seem able to help either, which should make me feel better, but doesn't. Any advice or help is appreciated. The log and crash report are attached.

iMac, 10.6.8

 

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Here is the kicker about this issue; after a reinstall of the OS, and replacing the iMac with another identical unit, the issue persists.

 

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I'm not surprised, actually, as I have stumped the IT folks at my company as well. I mostly posted here hoping for some insight or ideas how to attack this issue, which seems to have started experiencing a resurgence lately.