Safari: Safari Quits Unexpectedly: "If behavior is back to normal, move the 'com.apple.quicktime.plugin.preferences.plist' to the Trash. It will be recreated as needed by Mac OS X."
This is an interesting knowledge base article, some of the OS X debugging advice is very generic. OS X seems to be very prone to "corruption" of preference (.plist) files, and the consequences seem fairly mysterious. To put it mildly this is not a healthy situation; why doesn't the OS validate preference files and detect corrupted files?
I get random Safari Quits every few days. It's as annoying as all get out, especially when I have 15 tabs loaded and I'm paging through them.
It will be interesting to see if the problem is addressed in the next major release (Panther).