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Scary stuff, Brian. I know that sinking feeling. Just got bombed myself. Whether by Panda, because of user experience or a little too over optimized anchor text, I am not sure yet. Two weeks and my ranking have yet to come back. Clean up the site, remove the bad links and cross your fingers for a speedy return is about all you can do. Good luck with it.

Most studies seem to contradict each other at least a little on this but they all give a general idea like this one... not sure how accurate it is, but I found it ages ago at http://www.seoresearcher.com/distribution-of-clicks-on-googles-serps-and-eye-tracking-analysis.htm organic-ctr.jpg