Can you post a log of the error? Like a full stack trace? I presume you can get one by clicking "Report" when it happens. I'd like to see the other threads that are dying and the reasons.
Edit: I found <a href="http://discussions.apple.com/thread.jspa?threadID=1240427&tstart=15">this</a>. It suggests that SafariButtons is the culprit. It also suggests that you need to run the uninstaller rather than deleting the plist.
Edit 2: You can get the uninstaller <a href="http://www.remcokalf.demon.nl/safaributtons/SafariButtons-0.4.zip">here</a>
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