Somehow I have told my wordpress installation to put ‘/structure’ at the end of all permalinks – having corrected that I now end up with a lot of dead links in google and thus decided to create a nifty 404-page (actual look here)that either redirects or helps visitors to the relevant posts. Solutions from Scriptygodess: 404-redirects and parse search terms.
Update:
Long at last, I figured that some crafty wordpresser might have thought up a plugin to show referrers… and voila – one possible solution.